Tahitian cultured pearls: Tahitian cultured pearls have a novel black to grayish-environmentally friendly coloration. the big pearls, ranging from 11 mm to thirteen mm, are farmed around the volcanic atolls and reefs https://www.ebay.com.au/str/pacificpearlsinternational?mkcid=1&mkrid=705-53470-19255-0&siteid=15&campid=5339072275&customid=&toolid=10001&mkevt=1