Lab Notes
The Latest from GIA's Laboratories
Buff-Top Round Diamond
The modern round brilliant diamond is getting a “new old” look with the use of Japanese laser technology.
Large HPHT-Treated Fancy Pink Diamond
An improvement in HPHT treatment techniques achieves more intense pink coloration in large diamonds.
Pseudo-Synthetic Growth Structure Observed in Natural Diamond
A pseudo-synthetic growth structure is observed in natural diamond.
Green Diamond Treated with Radioactive Salt
Check out this green diamond that was treated with radioactive salt.
Yellow Synthetic Sapphire Colored by Trapped-Hole Mechanism
This specimen's yellow color originated from a "trapped-hole" mechanism, associated with trace amounts of magnesium and chromium, which usually produces an orange or reddish orangy hue.
