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

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