Our Billitonite jewelry collection contains a limited number of these rare tektite pendants, and some made with moldavite. Batu Satam stone aka Billitonite is an approximately 790,000 year old tektite found on the Billiton Island, Indonesia. The unusual glossy jet black luster & deep grooved surface has made them very popular with collectors. These raw and faceted gemstones are set by artists in our studio in both sterling silver and gold. We gift wrap every order and offer free shipping in the US.