Verdigris in Middle Eastern jewellery

Verdigris in Middle Eastern jewellery

by | Tips for collectors

What every collector needs to know

Verdigris in Middle Eastern jewellery

Updated June 6th, 2025

So, this happened… Recently, a Yemeni jewellery set came up for sale at an online auction. A friend sent me the listing, and one phrase in the description stopped me mid-sip:

The piece was labelled:

“A vintage metal ornate dress regalia, with decorative chains and turquoise decoration.”

I nearly choked on my coffee.

‘Turquoise decoration’?! No way. That greenish substance was not turquoise. It was verdigris – a corrosive compound that damages jewellery. Calling it a “decoration” is not just misleading – it’s potentially harmful to collectors and collections. The jewellery set in question is shown below: take a good look at that greenish hue, because that is what we’ll zoom in on here.

I made a 5 second reel out of it on Instagram (which got over 25k views) – but this topic needs a little more explanation than a social media caption. So, here’s a blog on verdigris, the Green Monster!

What is verdigris?

Verdigris is a corrosion product that forms on copper, brass, or bronze when these metals are exposed to moisture and air. The word comes from the French vert-de-gris. It means ‘grey-greenish’, and was used as main component in green pigments. Because it is unstable, and reacts with other materials, it ceased to be used in art as soon as other green pigments became available.

In scientific terms, it’s a mixture of copper salts, formed through the reaction of copper with water, oxygen, and carbon dioxide, often catalysed by organic materials like skin oils, textiles, or leather.

Traditional jewellery from North Africa and Southwest Asia often includes silver-copper alloys or decorative elements containing copper or brass. When these metals are exposed to humidity or stored improperly, verdigris can begin to develop. It looks like green crusts, patches, or powdery growths on the surface. The header above this blog post shows you what that looks like, as does the image of the Yemeni jewellery set.

Why is verdigris a problem for Middle Eastern jewellery?

While it may look picturesque (well, to an untrained eye: me, it makes me scream), it’s far from harmless. Verdigris is corrosive and unstable. If left untreated, it will continue to eat away at the underlying metal, weakening structural components, eroding fine details, and compromising the overall integrity of your jewellery.

If one piece shows signs of verdigris, this may indicate its storage conditions are too humid. If you have more than one piece in the same storage conditions, chances are verdigris may develop on those, too. [1] This makes it not just a problem for one piece, but a risk to an entire collection. It’s a nightmare, honestly.

In museum contexts, verdigris is treated as an active conservation concern. For private collectors, the risk is no different. Ignoring it can lead to permanent loss of historical material, diminished value, and potentially hazardous conditions if the corrosion product interacts with skin or textiles.

How to protect your Middle Eastern jewellery collection from verdigris?

Here are 5 things you can do to protect your collection of traditional jewellery from North Africa and Southwest Asia from verdigris:

Learn to identify verdigris

Verdigris appears as a surface deposit—often flaky, waxy, or powdery. It typically forms in crevices or where metal has been in contact with other materials.

Approach vague or overly positive descriptions with caution

Phrases like “turquoise decoration,” “aged patina,” or “natural wear” can mask underlying issues. If an image shows green deposits on a piece of jewellery that traditionally wouldn’t include turquoise, it’s likely corrosion.

Isolate affected items

If you discover verdigris in your own collection, remove the piece and inspect its storage conditions (see below). Wrap it in clean, acid-free paper or cloth and store it in a well-ventilated, dry area until you can address the issue. This is also why you will want to carry out regular inspections of your jewellery, so you can catch it early.

Store your collection correctly

Avoid high humidity. And if you cleaned an item: make sure it is dry through and through before storing it. Don’t use sealed plastic bags or containers, which trap moisture. Ziploc bags are fine, but don’t seal them shut. Use acid-free tissue and breathable materials. Keep metal components from direct contact with skin oils, leather, or synthetic materials that might accelerate corrosion.

Clean with care

Do not scrape or scrub verdigris off with household tools: this may scratch the metal or force corrosion deeper into the surface. Dry brushing or gently dabbing with a cotton swab under professional guidance may be appropriate, but for valuable pieces, always consult a conservator.

See more about cleaning your jewellery here (….and read this blog post first!).

Caring for Middle Eastern jewellery: know your stuff

And finally, a few thoughts…

The misidentification of verdigris as ‘turquoise decoration’ highlights a broader issue: lack of specialized knowledge in non-dedicated auction settings.

Because sellers, especially those listing pieces at generalist or online platforms, do not always have the training to accurately assess traditional jewellery from North Africa and Southwest Asia. Mislabelling corrosion as decorative inlay is so stupendously ignorant that it left me baffled, but you might also see signs of wear and damage described as part of the ‘design’. Now, don’t get me wrong, this is not necessarily out of bad intent! In most cases, it’s simply not-so-blissful ignorance.

But the thing is: the consequences are real.

For collectors, this basically means one thing: buyer beware. It’s essential to develop the skills to recognize materials, assess condition, and interpret seller descriptions critically. Accurately interpreting what you’re seeing (…and what you’re being told!) requires more than just an eye for beauty. It requires contextual knowledge: of materials, techniques, and signs of deterioration.

This is why learning matters. Because every piece tells a story – and it deserves to be heard, not eaten away.

So, thank you for being here and following my jewellery blog: together, we learn and preserve this heritage jewellery for the future!

—

More tips for collectors of Middle Eastern jewellery? Browse them all here!

Join the Jewellery List and receive new articles, jewellery news and more in your inbox!

—

References

[1] An earlier version of this blog mentioned that verdigris spreads. A knowledgeable reader of this blog pointed out to me that this is not the case, saying ‘keeping jewellery perfectly dry will prevent verdigris from occurring and prevent existing verdigris from affecting other areas’. Thank you!

The Bedouin Silver blog gives credit where credit is due! Transparent referencing and citing sources helps us all grow. Would you like to do the same and quote this article? Here’s how:

S. van Roode, [write the title as you see it above this post], published on the Bedouin Silver website [paste the exact link to this article], accessed on [the date you are reading this article and decided it was useful for you].

The Bedouin Silver Jewellery Blog: Sigrid van Roode

Sigrid van Roode is an archeologist, ethnographer and jewellery historian. Her main field of expertise is jewellery from North Africa and Southwest Asia, as well as archaeological and archaeological revival jewellery. She has authored several books on jewellery, and obtained her PhD at Leiden University on jewellery, informal ritual and collections. Sigrid has lectured for the National Museum of Antiquities in Leiden, Turquoise Mountain Jordan, and many others. She provides consultancy and research on jewellery collections for both museums and private collections, teaches courses and curates exhibitions. She is not involved in the business of buying and selling jewellery, and focuses on research, knowledge production, and education only. Sigrid strongly believes in accessibility of knowledge, and aims to provide reliable and trustworthy content: that’s why the Bedouin Silver blog provides references and citations.

Patina in Middle Eastern jewellery

Patina in Middle Eastern jewellery

by | Tips for collectors

what is patina?

Patina in Middle Eastern jewellery

Published March 18, 2024

Patina is a word you’ll see used often when talking about ethnic jewellery. It may be described as ‘having great patina’, and collectors may be afraid that cleaning ‘removes the patina’. But what is patina? You may be surprised to learn that it is used for two very different things!

Patina in ethnic jewellery: what it technically is

Corrosion. Patina refers to the thin layer that develops on the surface of metals due to natural oxidation and environmental exposure over time. You could think of the greenish hue that bronze statues or architectural elements may have, for example.

But it encompasses a broad spectrum of colours and textures, ranging from earthy browns to deep blues and reds. Patina is a result of the metal’s reaction with elements like oxygen, moisture, and sulphur. As such, it is technically the same as tarnish.

In some types of jewellery, patina is actually prized: it indicates that the jewel is indeed old. But, beware: there are tons of ways to create a fake patina on jewellery!

Patina, rust, tarnish: what is the difference?

Technically, none. They are all words for the oxidation in metals. But patina is often used for the colour effects in particular, while tarnish is more often used for the oxidation itself.

What is more, patina carries a positive connotation, as something beautiful. Tarnish, on the other hand, is used in a negative sense, as something damaging and ugly.

You will also find patina used for bronze, rust for iron, and tarnish for silver: all three denote oxidation processes and their visual results.

There are many different interpretations of the word patina going around, and to add to the confusion, collectors may mean something completely different!

Patina in ethnic jewellery: what collectors also mean by it

Usewear. Very often, the word ‘patina’ is used for something else entirely in the world of ethnography and collectors.

You will find it applied to a particular type of wear: ‘usewear’ refers to the physical evidence of wear and tear that occurs over time as a result of the item being worn or used in its intended manner.

Patina, in this context, usually means the soft wear on a surface as a result of years of rubbing or handling it. Other types of usewear, such as dents and scratches in a piece of jewellery are not called patina.

Although patina is technically the result of oxidation in metal, you will also see the word used with regard to wooden objects in the world of ethnography.

Here, too, it means ‘usewear’: a wooden handle that has been grasped countless times, will have a beautiful, deep colour and a silky, smooth surface. The same goes for antique furniture where doorknobs, edges and surfaces may show discoloration and a softness after decades of use.

Old silver jewellery in Cairo's Khan el Khalili

Patina in ethnic jewellery: what it definitely is NOT

Dirt. Honestly. Dirt is not patina. Dirt is an external substance that accumulates on the surface of jewellery. Dirt is easily removable with gentle cleaning methods. It does not alter the metal itself, like oxidation does, but can obscure the intended aesthetic of the piece.

Cleaning (see 3 methods how to approach that) can effectively remove dirt without impacting the authentic patina that may have developed over the years. The jewellery you see in the gallery above is just dusty and dirty: this is not what patina looks like!

Patina in ethnic jewellery: how to check for authentic patina

So, as we have seen, there are two types of ‘patina’ you can inspect your jewellery for.

Oxidation – Many ethnic jewellery pieces are made from materials like silver, bronze, or copper, which can develop a natural patina or oxidized layer over time due to exposure to air and moisture. This patina is often uneven and may be more pronounced in areas that have been frequently touched or worn.

Polishing and wear patterns – Certain parts of the jewellery, such as clasps, hinges, or chains, may show signs of polishing or smoothing from repeated use. Additionally, wear patterns may emerge on surfaces that come into contact with the skin, clothing, or other jewellery pieces, indicating areas of frequent movement and friction.

You can inspect an item for traces of usewear by employing various methods:

1 Use your eyes: Start by taking a good look at the jewellery. Carefully inspect the surface of the jewellery under good lighting conditions. Identify areas that are likely to show signs of wear and tear, such as the back of a pendant or the inside of a bracelet, and observe these closely. Look for scratches, patina, polishing marks, and any other indications of use. Note: the jewellery needs to be free of dirt to do this – dirt may actually obscure exactly these details.

2 Magnification: Whip out the magnifier! Check for subtle details such as fine scratches or tool marks. Patina, both in the sense of oxidation and usewear, may have been artificially applied.

3 Feel: If you’re looking to see if a piece has indeed been worn for a prolonged period of time, stop looking and close your eyes. Feel the jewellery: does it feel worn and soft, or do you still feel sharp edges? Open your eyes again and check these places on the jewel.

Patina, whether oxidation or usewear, is often used as a factor in authenticating a piece. But there is more to that than patina: this article gives 5 tips on how to establish whether your jewellery is authentic!

—

Never miss a thing on jewellery discoveries? Join the Jewellery List and find them in your inbox each month!

Looking for background information on your jewellery? Have a look at the courses – there’s so much available on the world of the jewellery you love!

More tips on collection management? Check this free resource or download the e-book!

—

Would you like to quote this article? Please do! Here’s how:

S. van Roode, [write the title as you see it above this post], published on the Bedouin Silver website [paste the exact link to this article], accessed on [the date you are reading this article and decided it was useful for you].

Sigrid van Roode

Sigrid van Roode is an archeologist, ethnographer and jewellery historian. Her main field of expertise is jewellery from North Africa and Southwest Asia, as well as archaeological and archaeological revival jewellery. She has authored several books on jewellery. Sigrid has lectured for the National Museum of Antiquities in Leiden, Turquoise Mountain Jordan, and many others. She provides consultancy and research on jewellery collections for both museums and private collections, teaches courses and curates exhibitions. She is not involved in the business of buying and selling jewellery, and focuses on research, knowledge production, and education only.

How to clean ethnic silver

How to clean ethnic silver

by | Tips for collectors

three methods

How to clean ethnic silver

Updated Jan 10, 2024

How to clean ethnic silver jewellery? And should silver even be cleaned in the first place? This article gives 3 practical methods – and what mistakes to avoid!

Should I clean ethnic silver jewellery?

Jumping right in here: that dull layer with which you found it in that antique store or in that dusty market stall…? That is not ‘authentic’ or ‘original’: the previous wearer would have taken pride in her jewellery glinting in the sunlight. Wearing it on a daily basis would itself have contributed to that shine. So yes, I do recommend to clean your jewellery.

Also, that dark coating you may have found it with, is not ‘patina’: this is just plain dirt. Seeing people claim that you should not clean darkened, dusty silver because of its ‘patina’ just makes me want to scream, in all honesty. Such lack of insight is actually endangering the quality of your jewellery.

Over-cleaning, however, should be avoided. Once the major layers of dirt and grime have been removed, a little tarnish actually protects your silver. Every time you clean it, you remove just the tiniest bit of the surface, leaving your silver exposed to another ‘tarnish-attack’.

You will want to keep an eye on how it develops, but don’t clean it too often.

And finally: proper cleaning of a heritage item is a professional’s job. You don’t attempt to restore a painting by yourself, either, right? The above considerations by the way all stem from my experience in the museum world. That includes the fabulous work restorers do, and how wrong choices regarding object maintenance gives them nightmares.

In any case: when you do need to clean silver, here are 3 methods that you can use at home, along with their advantages and disadvantages.

Before you start cleaning your ethnic jewellery…

…read this, if you haven’t already. There are a few things to consider before cleaning, that have to do with the silver content of your jewellery, loss of information and proper documentation.

The tips I’m sharing with you below are relevant to jewellery entirely made of good silver. If your jewellery contains any other materials such as wood, enamel, coral, beads, or is of an unknown alloy, bring it to a professional instead.

Another check to do before you start cleaning is the construction of the piece. Hollow pieces, such as amulet containers or anklets, should not be in contact with water: when water gets in, it is very difficult to get out and it may damage your piece from the inside out. For these, I recommend seeking help of a professional cleaner, too.

Because as I said earlier, cleaning and restoring jewellery is an actual profession. It requires years of study and a serious understanding of chemistry, metallurgy, gemmology and much more.

Anything more complex than a solid silver piece benefits from the care of a professional, so if you do own complex or composite pieces, or are having doubts whether your should attempt to clean anything yourself: do yourself a favour and treat your jewellery to a spa day with someone who knows what they’re doing. Ok?

Method 1: cleaning cloth

Silver can show discoloration after a while. It gets a little duller, and may show a yellowish or dark hue. This is easily remedied by buffing it with a silver cleaning cloth: all you do is rub firmly. Usually when your fingers start to hurt, this is a good sign you’re well on your way and you will see the silver surface return to its soft shimmer. This is sufficient for most jewellery as part of your regular upkeep.

Pro: easy to do

Con: basically nothing, although those fingers hurting is real

Method 2: polishing

When silver has turned black, you may need to polish it using an agent. Precipitated chalk works wonders. The chalk needs to be mixed with water to create a thick paste. Start with three teaspoons of chalk and add a quarter to half a teaspoon of water, stir the water in and continue to add small amounts of water as much as needed until you have a paste.

Rub the paste on the silver using a cotton pad (or a super soft toothbrush, like for babies, for intricate silverwork such as granulation) and gently polish the surface. After polishing, rinse the object thoroughly and make sure no dried chalk is left.

This method is unsuitable for hollow objects, as the rinsing may cause water and chalk residu to end up inside your ornament. Bring these to a professional.

Pro: works really wel

Con: chalk needs to be extremely finely ground to avoid scratching, your brush may also cause scratching, intricate designs need to be rinsed thoroughly, can not be used on hollow objects. Removes a bit of the surface: it will tarnish faster if not stored well.

Method 3: baking soda

The black tarnish can also be removed by submerging it in a baking soda bath. This reverses the process that caused the tarnishing.

Line a bowl with aluminum foil, add a couple of tablespoons of baking soda, sprinkle in some salt and add boiling water. When the water calms down after bubbling, submerge your silver items and let soak.

Again: do not use this method on items that contain anything else than silver, like beads, coral, enamel etcetera, or on hollow pieces.

Once you put your item in, you will see it cleaning up within seconds. Take the silver out as soon as the tarnish disappears (use gloves!), rinse under lukewarm water, dry thoroughly with a soft cloth and polish with a polishing cloth.

Pro: cleans very fast 

Con: unsuitable for hollow objects, pieces you don’t know the silver content of, and pieces with anything else than silver. Removes a bit of the surface: it will tarnish faster if not stored well.

Cleaning ethnic jewellery: keep track of what you did

And finally, make a note of your cleaning treatment in your object files. What you will want to note here are the date and the type of treatment, and if needed a before-and-after picture. This will help you keep up with  your routine checks on your collection: silver should be polished as little as possible, and a cleaning log helps to keep track!

Cleaning ethnic silver jewellery: the round-up

So, as you see, the decision to clean ethnic jewellery is one that requires some thought. Don’t start overcleaning it, but don’t let it get too dirty, either. One thing is certain: leaving it grimy is not authentic, and even outright damaging to your jewellery. And when in doubt, bring your jewellery to a professional restorer – this way, you’ll have the best of both worlds!

—

More tips for collectors? Browse them all here!

Join the Jewellery List and find regular jewellery news in your inbox!

—

References

Read more here on treatment of silver and copper alloy objects (opens a pdf)

 

Would you like to quote this article? Please do! Here’s how:

S. van Roode, [write the title as you see it above this post], published on the Bedouin Silver website [paste the exact link to this article], accessed on [the date you are reading this article and decided it was useful for you].

Sigrid van Roode

Sigrid van Roode is an archeologist, ethnographer and jewellery historian. Her main field of expertise is jewellery from North Africa and Southwest Asia, as well as archaeological and archaeological revival jewellery. She has authored several books on jewellery. Sigrid has lectured for the National Museum of Antiquities in Leiden, Turquoise Mountain Jordan, and many others. She provides consultancy and research on jewellery collections for both museums and private collections, teaches courses and curates exhibitions. She is not involved in the business of buying and selling jewellery, and focuses on research, knowledge production, and education only.