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

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

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.

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

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

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

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

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

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

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

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

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.

本系列第 4 部分（共 5 部分）：有色宝石（非钻石）的价值因素、设计和切工品质。本文深入分析了切磨师的各种选择，并探讨了业内用于评估相对价值的其他因素。

“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。

本系列第 3 部分（共 5 部分）：有色宝石（非钻石）的价值因素、设计和切工品质。本文将探讨切磨决策如何对宝石的颜色品质产生深远的影响。