AMET-R-001 Origin: Bolivia Grade: A Dimensions: 05-10g - Approximately 15-25mm 10-20g - Approximately 25-35mm Origin: Bolivia Grade: A = good Tumbled ametrine stone from Bolivia. Sold individually. Weight of 05-10g or 10-20g Shapes and colors may vary from one stone to another. The name given to the ametrine stone comes from the contraction of the names "amethyst" and "citrine." This stone is born from a natural geological process combining the two stones. From this quartz blend, the stone offers an uncommon appearance. Indeed, it has two distinct shades, the purple of amethyst and the yellow of citrine. It is an absolutely exceptional bicolor gem.