Home Ask Arthur Dye Green Quartz Bangle

Dye Green Quartz Bangle


first photo

Dear Arthur,

Thank you for the great opportunity that you have provided online to help many to understand more about jade and other stones.

Actually, I have a green bangle that has nice veins inside of it but when running my fingernail over the surface, I can feel cracks all over it. I decided to use a magnifying loop to see what was happening on the surface, and I could see thin cracks that form like cracked ice all over the surface. However, when running my hand over the bangle it feels very smooth.


Can you help me understand what is causing the cracks? I enclosed an image with the others. It shows a similar effect to what I saw on the surface when I looked at it through the magnifying glass (10X).

Is it type A or B? Thank you in advance for your input!



Hi Leah

Unfortunately, your bangle does not belong to the pyroxene group mineral content of Jadeite Jade.

Your bangle is a dye green quartz.

quartz crystal
Quartz crystal cluster. Source: wikipedia

Quartz is a silicate compound and it is found abundantly on the earth crust. Rock crystal is another name for it, when it is clear and semi translucent or almost transparent.


Dye green quartz is quite common and it is often used as an imitation to substitute for other green precious gemstones, amongst which is dyed green bangle used to imitate jade bangle. The original quartz slab is quite clear and it is through a process called quench-crackling that green dye is forced in. The quartz slab is heated to quite a high temperature. (Quartz has a melting point of about 1670oCentigrade.) Then the slab is suddenly immersed in iced cold water. The expansion and sudden contraction of the molecules within the quartz will cause the stone to fracture from within.  Thus, when the slab is fractured dyes can be forced into the cracked capillaries. The cracks are very fine lines and the bangle is then re-polished so that it retains it smooth surface.

Quench-crackled quartz showing fragments and fractures within

You can see it quite clearly using a 10X loupe, as you have done.

I hope that you did not pay a lot of money for this imitation.



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I am a Graduate Gemologist trained at the Gemological Institute of America (GIA) in New York City, USA. I hold an MBA degree from Cranfield University, United Kingdom, and a Bachelor degree in Mathematics. My earlier profession was a banker until I found jade in Myanmar (Burma) in the early 90s. I have traveled to the fabled Hpakan Jade mines, and Mogok, the world’s famous rubies and sapphires mines in upper Burma, with my second son. Three of my children are also Graduate Gemologist, GIA, NYC and they deal in diamonds, gemstones and jade. 我是在美国纽约市的美国宝石学院(GIA)接受过培训的宝石研究学家。 我拥有英国克兰菲尔德大学的工商管理硕士学位和数学学士学位。我以前的职业是银行家,直到90年代初我在缅甸接触到玉石。我曾经和我的次子一起去过缅甸上流传说中的哈帕翡翠矿山和莫谷矿山, 莫谷矿山是世界上著名的红宝石和蓝宝石矿山。我的三个孩子都是纽约市GIA毕业的宝石研究学家, 他们专门处理钻石,宝石和玉石.


  1. Hi, Arthur!

    Great having you back! Your web site kicks ass!

    I missed your site when you took time off, and am really glad to see you back in action. Was just telling my husband that I think you have helped a lot of new jade lovers to avoid getting ripped-off, especially buying jade online.

    This bit about “quenched” gemstones is new to me. Several years ago, I bought a Chinese export piece listed as quenched amethyst, which turned out to be tourmaline. Subsequently, I have seen weird-looking stones that kinda looked like tourmaline, but my gut said, “Don’t buy!” Now, reading this column, I’m positive that the pieces were quench-crackled.

    How ’bout an article on tourmaline? Are viable lab-grown tourmalines on the market yet? How difficult is tourmaline to carve? I’ve seen beauties in online photos, along with really crudely-hacked pieces. I truly would love to see an article on that stone.

    Again, welcome back!

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