This chart shows that, on the basis of cut but unset value, emerald is the most important gemstone import for the United States after diamond. It also has an average per-carat price that is much higher than ruby and sapphire. These amounts are approximately equal to consumption because the...
Price per carat reflects the size, evenness of the color, the clarity and the brightness of the stone. We prefer to use the GIA Colored Stone Grading System, this is an exceptionally good method for noting the quality of color stones. In commercial grade Blue Sapphire you can expect to ...