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

A look at the gemological properties and chemical composition of this light blue to light green to green gem material, which is suitable for cabochon cutting.

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

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

An emerging corundum deposit in northeastern China is discussed.

The gemological properties of the first documented occurrence of red cordierite, from Madagascar, are examined.

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

A rare spinel, featuring a Star of David pattern and multiphase inclusions, is examined in Bangkok.

インペリアルトパーズの原石が、見事なフリーフォームの宝石へと彫刻される。

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

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.

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.

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

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

Optical properties in a taaffeeite are explored.

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.