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

