This product is a 4 piece lot of Australian Blue Sapphire gemstones, each measuring 5x4mm with an octagon cut and faceted for a very good cut grade. The gemstones are transparent and have an asterism effect, sourced directly from Australia and certified as per requirement. They are natural, unheated, and untreated, making them a vintage piece with slightly included clarity. Wholesale, these gemstones are perfect for jewelry making and come directly from the country of origin.