Gem News published on IGR вЂ“ Italian Gemological Review #11, Winter 2020-21

Further, the Institute is working to incorporate additional commentary for post-growth treatment of fancy color diamonds in the near future. IGI Customers will also have the opportunity to request specific diamond types, including type IIa for CVD diamonds and type II for HPHT diamonds. So a high-pressure, high-temperature (HPHT) treatment is very often required to improve the color of the CVD synthetic diamonds after their growth.

THE INTERNATIONAL GEMOLOGICAL INSTITUTE (IGI). For the other CVD-created diamonds, the reports will note that they вЂњmay include post-growth treatmentвЂќ.Д¬VD-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. A certificate outlining the colour description, origin and luminescence of fancy coloured stones. While previous reports always indicated that lab-grown diamonds вЂњmay include post-growth treatments to alter colorвЂќ, the Institute will start stating if a synthetic diamond is вЂњas grownвЂќ or may have been treated.ДЇor 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 вЂњas grown with no indication of post-growth treatmentвЂќ. 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.

Igi diamond report