Press ReleasesGSI Discovers Extreme Color Instability in CVD Diamonds Color went from near colorless to blue color. Published 7 months ago on December 6, 2019By INSTORE Staff Share Tweet (PRESS RELEASE) NEW YORK – Researchers at Gemological Science International (GSI), one of the largest gemological organizations in the world, witnessed a case of extreme color instability of a CVD diamond within its laboratory testing facility.During standard testing procedure, a 2-carat CVD diamond in GSI’s laboratory was exposed to high powered UV rays and went from near colorless to blue color. JimmyCastPodcast: New Jewelry Store Owner Wilson Lin on Why He’s Opening This Year, of All Years JimmyCastPodcast: Larry Rickert on Working From Home and His Last Big Project JimmyCastPodcast: Jason Druxman Discusses Differences of Corporate and Independent Jewelry Stores The stone then was returned to the vault and stayed in it for a week and a week later the stone still retained the blue color. While it’s known that CVD diamonds can change colors under this type of ultraviolet light or extreme heat, typically a diamond of this variety returns to its normal color after 30 minutes to an hour of direct sunlight. The GSI lab team discovered that under standard ambient lighting conditions, this particular stone took two and a half hours to return to normal color.Though the GSI team stresses that most CVD diamonds do not change to this extreme, they emphasized the importance of lighting conditions when color grading diamonds.“It is strongly suggested that all laboratory-grown CVD diamonds are placed in a full-spectrum light box for at least 30 minutes before color grading,” said Nicolas Del Re, chief information officer of GSI. Based on these findings, he notes that color changes may happen through casual use as well.“When wearing out in the open, CVD diamonds may change in coloration upon even subtle exposures to electromagnetic radiation such as UV rays on a sunny beach or under a blacklight in a nightclub for example,” said Del Re, noting its due to Photochronism. “We have the electrons in defects within a CVD diamond causing the energy state to change and in turn affect the way color is absorbed on the visible spectrum.” Advertisement Related Topics: diamondsGSI click to Comment(Comment) Advertisement SPONSORED VIDEO Wilkerson TestimonialsWhen Liquidation Is the Best Option, This Legendary Jeweler Chose WilkersonGeorge Koueiter & Sons Jewelers, a 65-year old jewelry institution in Grosse Pointe, MI, had always been a mainstay in this suburban Detroit community. 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