Lab Created Spinel Synthetic Gemstones Wholesale Price from China Manufacturer
The spinels are any of a class of minerals of general formulation A2+B23+O42- which crystallizes in the cubic (isometric) system; common crystal forms are octahedral , usually twinned. It has an imperfect octahedral cleavage and a conchoidal fracture. Its hardness is 8, its specific gravity is 3.5-4.1 and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades in 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 is the Black Prince's Ruby and the 'Timur ruby' in the British Crown Jewels, and the 'cote de Bretagne' formerly from the French Crown jewels. The Samarian Spinel is the largest known spinel in the world, weighing 500 carats (100 g). 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 became used.
spinel color chart
There are many kinds of spinel gemstones as for your choice, for example:marquise,round,oval,pear, heart,rectangular,square,fan,lozenge,trapezoid,flower,triangle,special ,ingot,water drop,star,ball, butterfly,kite, bullet,arrow and so on.