Gems & Gemology, the quaterly scientific journal of the Gemological Institute of America in its Spring 2021 issue reported the surprising news of the detection of a lab-grown Ruby being filled with Lead glass, a process usually applied to natural rubies using a filling material with a Refractive Index very close to natural rubies, to [...]
Source: https://news.internetstones.co…o-gia-for-identification/
