Emerald Isle Green Heart Cut Onyx Faceted Briolette All Season Gemstone 12mmx12mm May Birthstone. You will receive 6 of the gems above.Onyx was used in Egypt as Early as the Second Dynasty to make Bowls and other Pottery Items.The Ancient Romans Entered Battle Carrying Amulets of Sardonyx Engraved with Mars , The God of War. This was Believed to Bestow Courage in Battle. In Renaissance Europe Wearing Sardonyx was Believed to Bestow Eloquence. A Traditional Persian Belief is that it helped with Epilepsy. Onyx is the Birthstone of May. This Onyx has been Drilled and Cut for your Jewelry making conveniance. Flattered by silver!