Crystallised carbon, the hardest of all known substances. A diamond is pure colourless carbon used in jewellery, where it is cut into facets to increase its brilliance. It is used in watchmaking to decorate bracelets, cases, bezels etc.Melody DiamondThe "Melody Diamond" was invented by Belgian-born Gabriel S. Tolkowsky and is a process by which the reflection of the light of each diamond is transposed into music. The melody produced by each stone provides gemmologists with a fresh tool for identifying stones.GOLden DiamondThis new form of diamond is not actually a diamond but a gold fragment that has been specially treated to enhance its resistance and faceted exactly like a natural diamond. This "stone" can be yellow, pink or white and, when subjected to complicated...