Testing reveals interesting inclusions in Chinese emeralds to be calcite and dolomite.

Lab analysis proves that a bangle with “floating flower” inclusions believed to be jadeite jade or albite is actually highly translucent aventurine quartz.

Rio Tinto sells its final collections of pink and blue Argyle diamonds at record-breaking prices.

Renewed mining interest in Montana promises a return of the famous Yogo sapphire to the gem trade in the coming years.

Microscopic observation by the Tokyo lab revealed a mysterious networked pattern, resembling that of a circuit board, covering the overall surface of a blue-green tourmaline.

A notable 31.06 ct well-saturated orange sapphire was recently submitted to the Carlsbad laboratory.

Examination of a large black oval cabochon reveals an intense orangy brown and black polyp structure, indicating natural black coral.

Pink faceted tourmaline reveals unique colorless windmill-shaped zoning.

A quartzite bangle mimics the appearance of jadeite jade.

The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.

Meticulous testing of a bangle submitted to a Taiwan gemology lab proves it to be a composite of red calcareous coral and epoxy.

Intriguing bicolor sapphires and spectacularly colored thin sapphire slabs are produced by mines in Rock Creek and Inverell, respectively.

Faceted quartz contains numerous unusual white radial inclusions identified as bavenite.

Alex Vock shares his expertise on natural saltwater nacreous pearls.

The Carlsbad laboratory encounters its first example of a transparent purple faceted single crystal anhydrite.

An octahedral fluorite crystal is observed in Brazilian alexandrite.

Lovely rose-pink natrolite from Indonesia is dubbed “rhodatrolite” for its color and texture.

A particularly fine unheated purple Montana sapphire is noted for both its size and its multiple diverse inclusions.

Copper in the zinc silicate known as hemimorphite creates an electric blue color similar to that of Paraíba tourmaline.

Examination and testing of a beautiful large pink sapphire establishes its lack of treatment and its origin in Mozambique.