Chromium-diffused Corundum
Photo by Bilal Mahmood.
It’s important to be aware of older treatments that may appear on the market. While not terribly common, sometimes stones that have been treated with older treatments come through the lab. These two purple-pink gems were submitted with the client thinking they had been heated. No heat, just chromium diffusion!
More research about these stones was published in The Journal of Gemmology, Volume 34, No 6, 2015 pp 486-488. See below for the article!
To download a copy click here
