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| Gemological certificate of Color change Chrysoberyl |
| Color change in (Artificial Light) Natural Faceted chrysoberyl, |
Spinel crystallizes in the isometric system; common crystal forms are octahedra, usually twinned. It has an imperfect octahedral cleavage and a conchoidal fracture. Its hardness is 8, its specific gravity is 3.54.1 and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades of red, blue, green, yellow, brown, or black. There is a unique natural white spinel, now lost, that surfaced briefly in what is now Sri Lanka. Some spinels are among the most famous gemstones: Among them are the Black Prince's Ruby and the "Timur ruby" in the British Crown Jewels, and the "Cte de Bretagne", formerly from the French Crown jewels. The Samarian Spinel is the largest known spinel in the world, weighing 500 carats (100g).
The transparent red spinels were called spinel-rubies or balas rubies. In the past, before the arrival of modern science, spinels and rubies were equally known as rubies. After the 18th century the word ruby was only used for the red gem variety of the mineral corundum and the word spinel came to be used. "Balas" is derived from Balascia, the ancient name for Badakhshan, a region in central Asia situated in the upper valley of the Kokcha River, one of the principal tributaries of the Oxus River. The Badakshan Province was for centuries the main source for red and pink spinels.
Order # 786: Agate stones inside with name Allah Very very rare pc
Mr Shyam Sunder Sharma (Orissa Gems)
681, Bichun House, Kishan Pole Bazar, Ja, Kishanpole Bazar, Jaipur, Rajasthan - 302001, India
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