Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.

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.

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

A synthetic spinel has undergone quench-cracking treatment, possibly to make it appear as a natural specimen.

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