Sapphires are also a variety of corundum ... Tourmaline’s wide array of colors and unique ability to display multiple colors simultaneously make it a favorite among collectors and jewelry ...

Its ability to resist scratches makes it an excellent choice for screens and protective coatings. However, its extreme ...

(PRESS RELEASE) The World Jewellery Confederation (CIBJO), the American Gem Trade Association (AGTA) and the International ...

They are formed of simple molecules or individual elements arranged in repeating chains, sheets, or three-dimensional arrays ... color is caused by traces of chromium. Corundum also forms sapphire ...

“Color is a natural resource on which we ... and a ring studded with a rainbow array of pink sapphires and spessartite ...