A round-cut specimen set in a ring is the first mounted CVD synthetic melee diamond identified by GIA.

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.

A diamond’s inclusion, with a radiation stain shaped like a halo, is found to be monazite.

An opal rough is immersed in water and treated with oil and Opticon to observe effects on transparency and play-of-color.

An unusual doublet consisting of two sections of natural emerald is examined the Tokyo lab.