my SAPPHIRE stones are natural, uncut, unshaped, untreated, rough, round, cleartransprent, no crack, no inclusion & of all sizesThe Sapphire stones are unheated, natural, untreated, uncut, transparent clear and appear in variable shapes and sizes. The sizes vary from very small (less than 0.1 gram) to very large pieces (10 gram per piece). The most observable colour is blue which can be deep, sky, sea, light or dark blue. Some sapphire stones appear colourless and they are also found in shades of gray and black.Purple, violet, and green are the most common secondary hues found in blue sapphires. Sapphires may be treated by several methods to enhance and improve their clarity and color. It is common practice to heat natural sapphires to improve or enhance colour BUT my sapphire stones have not undergone any heat treatment or diffusion. Any body interested in the sapphire stones from FEDAMINE MARMA CAPAM can test the samples in the laboratory of his choice to be sure that there are natural. These Sapphires are mined from alluvial deposits or from primary underground workings in the Adamawa region of Cameroon. That area has been exploited for its sapphires started in 2001, and the activity is done traditionally by small scale miners equipped with rudimentary tools by CAPAM