Members of the Japanese gem and jewelry industry gained exclusive insight into the world of colored diamonds when John King, GIA’s (Gemological Institute of America) chief quality officer and noted expert on colored diamonds, presented an update at the Institute’s Gem Fest in Tokyo on April 11.
King said that Japan is one of the world’s largest consumer markets for colored diamonds. “While colored diamonds have been coveted for centuries, it wasn’t until the mid- 90s that they really emerged on the mainstream jewelry market. These rare stones were once reserved for royalty and the very wealthy, but today are more and more prevalent in the broader gem market,” he I added. King discussed rare colors seen in the GIA lab, such as purple, pinkish orange, green and blue-green, along with unusually large treated colors, HPHT (high pressure, high temperature) treated colors, synthetics and treated synthetics. He also reviewed the new trend of pale colored diamonds, which are equivalent to F, G, H and I on the D to Z scale.