aser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.

The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.

A sapphire cabochon with an unusual appearance is seen at GIA’s Tokyo lab.

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.

An unusual assembled stone is examined at GIA’s New York lab.

Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.

Over the last decade, the production methods used to create synthetic diamond melee have improved substantially, along with the quality of the specimens themselves.

Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

Rare pearls, along with their shell, are studied in the Hong Kong lab.

A Medusa quartz from Paraíba, Brazil, hosts a surprising inclusion.

Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.

Seldom-seen inclusions are found in a host material that is rare in its own right.

For the first time, wurtzite is found as an inclusion in gem material.

Lotus Gemology receives submissions of star stones on a regular basis, so when we first saw the specimen shown here, it appeared to be one among many of our usual stones to test.

A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.

A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.

A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.

A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.

“有色宝石（非钻石）的价值要素、设计和切工品质”系列的第 5 部分（共 5 部分）探索了工艺对切工品质的影响。