Sugilite semiprecious stone cabochons have a 6-7.5 hardness.
The purple stones range in color from a pinkish purple to a deep purple. The most valuable, and rarest, Sugilite cabochon stone is translucent.
Sugilite is named for the Japanese geologist Ken ichi Sugi, who first discovered the mineral in Japan in 1944. The lapidary grade was first found in South Africa in the early 1970's. Sugilite jewelry stones are also known by the trade names Lavulite, and Royal Azel.
Sugilite gem stones are said to assist in overcoming feelings of hopelessness. It is an excellent semiprecious stone for people who tend to think negatively or lack confidence. It also is believed to be good for people who suffer from nightmares or insomnia. Sugilite is said to offer peace of mind and calming effects.