The art is made from a 65 mm specimen of blue Aquamarine and black Tourmaline from Erongo, Namibia
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The model used is a beautiful specimen of Aqua-blue Aquamarine and Black Tourmaline from Erongo Mountains, Erongo Region, Namibia
The specimen has great quality with translucent, damage-free crystals.
The size 58x65x25 mm (91 grams).
Namibia has some of the best Aquamarines in the world, and here you can see the location and a couple of other pictures from Erongo Mountains:
Also, I can highly recommend that you take a look at this Flicker Album from Namibia. The second part with stone formations is from Erogon Mountains. The pictures are just incredible!
Video/pictures of the specimen used for the NFT: