|In 2014 two large, rare color-changing diaspore gemstones were donated to the Smithsonian Institution’s National Gem Collection, thanks to Milenyum Mining Ltd.|
The Dubai-based miner donated the stones, a 44.48-carat faceted oval-shaped diaspore and a 159.33-carat cat’s eye cabochon diaspore, at the American Gem Trade Association’s GemFair.
|Diaspore is a naturally color-changing gem, and is mined at only one source, the Anatolia Mountains of Turkey. Milenyum is the only company that mines the gemstone.|
Zultanite and Csarite are trade names.
| Diaspore is a durable gemstone with a hardness of 6.5 – 7 on the MOHS scale. Since Diaspore has perfect cleavage in one direction it can be difficult to cut because parts of the stone will cleave off.|
Typical loss cutting rough diaspore is 98 percent. This makes large gemstones extremely rare and valuable.
|“To our knowledge, currently there are fewer than 20 faceted csarite gemstones in the world that have a weight of 40 carats and above. Given the rarity of this unusual gem, we feel the Smithsonian’s National Gem Collection is a fitting home for two of the few examples available in this size and quality,” said Milenyum Mining President Murat Akgun.|
The National Gem Collection is housed at the National Museum of Natural History in Washington.