Summarizes the features of 480 nm band diamonds, including chameleon diamonds and those with unmodified orange hues, for rapid identification or advanced gemological testing.

Organic-rich material is observed through an opening in a hollow natural pearl.

Gersdorffite inclusions in quartz exhibit either triangular or hexagonal shapes when viewed from different directions.

A unique inclusion scene caused by devitrification is observed in artificial glass.

Examination of a Fancy Deep brownish orangy pink diamond reveals evidence of treatment to enhance its color.

A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

A 2.50 ct natural type IIa/IaB diamond submitted to the Dubai laboratory shifts to type IIb after deep-UV excitation.

11月初旬、カリフォルニア州カールスバッドにあるGIA本部で開催された理事会において、同機関はSusan M. Jacques氏に対し、最高栄誉であるRichard T. Liddicoat功績賞で表彰しました。

During the GIA Board of Governors meeting in early November at the Institute’s headquarters in Carlsbad, CA, the Institute honored Susan M. Jacques with its highest honor, the Richard T. Liddicoat Award for Distinguished Achievement.

A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

The board of directors of GIA India Laboratory Pvt. Ltd. (GIA India) has appointed Amit Pratihari as managing director, responsible for all aspects of GIA India’s gemological laboratories in Mumbai and Surat, as well as the GIA India school in Mumbai.

The board of directors of GIA India Laboratory Pvt. Ltd. (GIA India) has appointed Amit Pratihari as managing director, responsible for all aspects of GIA India’s gemological laboratories in Mumbai and Surat, as well as the GIA India school in Mumbai.

An overview of the Summer 2025 Gems & Gemology content.