Clusters of micro-inclusions form starburst-patterned clouds in a 2.50 ct Faint yellow-green round brilliant diamond.

GIA’s Tokyo laboratory examines three grossular garnets displaying six-rayed black inclusions arranged in a snowflake-like pattern.

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 diamond feather and its reflection resemble an unidentified flying object.

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

Fungal inclusions are studied in two specimens of Burmese amber.

Showcases the diverse natural shapes of rough diamonds and explores how geological processes create their unique forms.

Examines correlations between surface microstructures and the orange peel effect in Russian white nephrite, proposing a formation model and revealing distinctive microfeatures specific to the material.

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

An overview of the Fall 2025 Gems & Gemology content.

Investigates the morphological changes of macle diamonds during the growth process by exploring their three-dimensional internal zonal structure.

Immiscible two-phase fluid inclusions are investigated in a 0.48 ct Paraíba tourmaline.

11 月初，在加州卡尔斯巴德总部举行的 GIA 理事会会议上，研究院授予 Susan M. Jacques最高荣誉 — Richard T. Liddicoat杰出成就奖。

11 月初，在加州卡尔斯巴德总部举行的 GIA 理事会会议上，研究院授予 Susan M. Jacques最高荣誉 — Richard T. Liddicoat杰出成就奖。

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.