Purple Sugilite sterling silver pendant on a delicate choker is just what you wanted! This is a perfect gift for yourself or someone else. Sugilite Gemstone Information. Sugilite is a rare purple cyclosilicate mineral that was named after the Japanese petrologist, Ken-ichi Sugi, who first identified it in 1944 in Iwagi Islet, Japan. ... In 1980 sugilite was officially classified as a rare gem, which caused its price to increase. This unique one of a kind made with love necklace is made with love just for you!