A non-nacreous pearl with a netted surface resembles the exterior of a melon.

An eight-rayed star peridot with a star system made up of two different sets of inclusions is described for the first time.

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

Play-of-color pattern in Ethiopian opal is reminiscent of a turtle’s shell.

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

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.

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

A diamond feather and its reflection resemble an unidentified flying object.

Fungal inclusions are studied in two specimens of Burmese amber.

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

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.

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.

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。

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