So a high-pressure, high-temperature (HPHT) treatment is very often required to improve the color of the CVD synthetic diamonds after their growth. For the other CVD-created diamonds, the reports will note that they “may include post-growth treatment”.ĬVD-produced diamonds result often in an unsatisfactory brown color due to impurities in the gas which is the source of Carbon and the relatively high growth rate. While previous reports always indicated that lab-grown diamonds “may include post-growth treatments to alter color”, the Institute will start stating if a synthetic diamond is “as grown” or may have been treated.įor untreated Chemical Vapor Deposition (CVD) and High Pressure High Temperature (HPHT) diamonds, the new reports will outline the individual growth process and indicate specifically that the stones are “as grown with no indication of post-growth treatment”. The International Gemological Institute (IGI) has announced that new details highlighting the manufacturing process of lab-grown diamonds are now added to its reports, effective January 2021.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |