This is a fantastic Tanzanite of incredible violet to blue colors hand set in solid gold with a solid gold 20" rope chain. With every turn it seems to change from violet to blue, then blue to violet. This genuine gemstone has been mined from the earth in Tanzania. It is oval shape and weighs over 3 carats. It measures about 11.81 x 9.84 mm, that's about 7/16 x 1/3 inch. This gemstone weighs 3.30 carats. Tanzanites are heated in processing. This gem has been hand set into this solid 14K Gold pendant that is marked on the back. Also included is a 20 inch solid 14K Gold chain about 1.50 mm thick. inventory #6629.