Ametrine 10x11-11x16mm Nugget - 15-16 Inch Crazy It is sometimes used for

It is sometimes used for scalpel blades in cardiac surgery

a variety of Feldspar

so named because the ancient Incas believed the stone to be the petrified blood of their ancestral rulers

Topaz obtains much of its popularity from its beautiful colors and its status as a birthstone

Ametrine 10x11-11x16mm Nugget - 15-16 Inch Crazy It is sometimes used forAmetrine is quartz that occurs in bands of purple and yellow. As the name suggests, it is a combination of Amethyst and Citrine. The different colored zones in the stone result from different oxidation states of iron, due to exposure to different temperatures during its formation. It is believed that Ametrine was first introduced to Europe by a conquistadors gift from Bolivia to the Spanish Queen.