Demantoid is one of the gem varieties of the garnet mineral, andradite. The formula is: Ca3 Fe2 Si3 O12. With chromium as substitute as the cause of green color.
Some typical bissolite inclusions may be seen only with a loupe.This piece comes from the famous Sferlun quarry,Val Malenco Valley, Italy,now very hard to get.
Weight: 0.91 ct.