Chromium Surface Diffusion Treated “Ruby” By: Jeffery Bergman – ASG SGC of EighthDimensionGems Photos by Ayub Muhammad of Pretty Little Gem July 20, 2023 – Bangkok, Thailand. Fig. 01 & 02. Face-up and pavilion shots of a 7-carat chromium surface diffusion treated “ruby”. Photos by Ayub Muhammad.  First documented by the GIA in the early … Continue reading Chromium Surface Diffusion Treated “Ruby”