0.46 Carats Natural Pink Tanzanite Gemstone - Round. Prima Gems USA was established with one goal in mind. Prima Gems India employs over 100 world class gem cutters.CTS NATURAL PINK TANZANITE - ROUND. You can be sure that we will do everything possible to make things right. The item "0.46 Carats Natural Pink Tanzanite Loose Gemstone Round" is in sale since Tuesday, March 25, 2014. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Tanzanite". The seller is "primagemsus" and is located in New York, New York. This item can be shipped worldwide.