Diamond Group, a Vicenza-based business that is a leader in selling diamonds and making jewels that feature the stone par excellence. It is small and easy to use, and, most importantly, accessible to all—Sherlock detects all types of diamonds made in a laboratory, mounted or not, and in the white color range (D-K). It also detects natural stones that have undergone the HPHT (High Pressure High Temperature) treatment to improve color. The way it works is by looking at the colors that appear on the gems tested. If it is all blue with no red at all, it is a natural diamond. If red or other colors (purple, orange, yellow or green) appear, then it is a CVD (Chemical Vapor Deposition) or modified (HPHT) stone.