Colored Diamond Jewelry: We offer beautiful selections of treated colored diamond engagement rimgs, wedding bandands, anniversary rings, earrings, bracelets, necklaces and pendants. Fancy colored diamonds are natural diamonds that have been treated with electron accelerators operating at various energy levels according to the color required. The treatment creates a highly stable and permanent color change without leaving any harmful traces of radiation on the diamond. Therefore, the diamond can be used in jewelry immediately. Natural fancy color diamonds are extremely rare and expensive.