A detailed characterization of serpentine from this mountain locality, focusing on its use as a gem material.

Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.

Lazulite crystals grow on and within a quartz specimen from Yukon Territory, Canada.

A debris pattern within a rose quartz’s fracture resembles a dinosaur’s footprint.

An overview of the 2016 gem shows.

A look at the resumed operations and new production of Kenya’s Scorpion tsavorite mine.

A closer look at the Spectrum award-winning pendant from Nature’s Geometry.

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.

Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.

Optical properties in a taaffeeite are explored.

Updates on Afghan and Tajik materials, as well as treatment options to improve the clarity of various types of tourmaline.Updates on Afghan and Tajik materials, as well as treatment options to improve the clarity of various types of tourmaline.

A recent rush in Madagascar yields new sapphire production.

Freeform fordite accumulated from a now-defunct method of painting automobiles was on display at Tucson.

一块帝王黄玉原石被雕刻成一颗精美的自由形态宝石。