Friday, September 18, 2020
By Steven Rees, GG, Executive Director at IGI and John Pollard, educational consultant at IGI
Presto chango! Did you ever dye your hair? Paint your walls? Use an Electron Beam to change your diamond’s color?
It’s not science fiction. It’s real. It’s amazing. And the science behind it is totally cool. Let’s first consider that this beautiful yellow sparkler was an amazing accomplishment in itself: A whopping 10.06 carat Fancy Intense Yellow Lab-Grown diamond, previously submitted to IGI for full assessment and grading.
In July 2020 the owner, Ben Hakman of Diamond DNA, returned his beautiful stone to IGI for a second round of grading – following an astounding makeover. Upon assessment, IGI’s gemologists determined that – not only had the color been fundamentally changed to pink – the process had also increased the level of saturation to Vivid.
Understanding the science
IGI was informed that the color had been shifted from yellow to pink through irradiation using a 5MeV Electron Beam Transfer system. IGI gemologists were able to confirm this using visible spectroscopy: The notable peak at 595 indicates irradiation. The second notable peak at 637 indicates the diamond’s nitrogen-vacancy center, which is typical of treated pink diamonds.
The HPHT process can result in distinctive inclusion types. Essentially, HPHT replicates the natural conditions under which diamonds formed 100 miles below the surface due to subduction: A carbon source, a diamond seed and a metallic catalyst go into an octahedral cell. The cell is placed into a massive mechanical press where the contents are heated near 1,500 C and subjected to staggering pressure. The melting metal dissolves the carbon and the pressure causes precipitation to the diamond seed, growing a larger diamond. The level of pressure from those presses has been compared to what you’d experience if you balanced a jumbo jet on the tip of your finger.
Since a metal catalyst is used some clarity characteristics can take on a decidedly metallic appearance, such as the rod-like inclusions within our subject diamond, which was originally grown using the HPHT process.
Many thanks to Ben Hakman and Diamond DNA for permitting the images and video of this landmark lab-grown diamond, transformed from Fancy Intense Yellow to Fancy Vivid Pink, to be shared here. I hope you find it as amazing, technical and awesome as I do.
For More Information:
See the imagery, before and after: Fancy Intense Yellow to Fancy Vivid Pink.
View the Fancy Vivid Pink grading report.
See the Original Post via IGI.org: gemblog.igi.org/see-this-10-carat-lgd-transformed-from-yellow-to-pink/.
The International Gemological Institute (IGI) has 24 laboratories in all major diamond and jewelry centers around the world. For over 40 years, IGI has provided the fine jewelry community and consumers with a broad range of services including independent diamond grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestation of origin, laser inscription services, as well as the issuing of the traditional jewelry identification report. Regardless of location or marketplace, an authentic IGI Laboratory Report is the common language of trust and confidence in the gemological world. For more information, please visit: www.igi.org/.
AT: 09/18/2020 02:25:51 PM
Post a Comment