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

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

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.

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

Natural pearl cores are used to simulate the appearance of natural pearl growth in two assembled pearls mounted in a pair of earrings.

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

The Carlsbad lab receives a laboratory-grown colorless sapphire with weblike fractures containing concentrations of dye.

A 63.17 ct dumortierite rough crystal is examined in the Bangkok laboratory.

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.

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

A study analyzing the thermal behavior of the 3161 cm^–1 IR feature in 10 natural corundum samples from various deposits.

A combination of growth and dissolution features contribute to a yellow diamond’s unique shape.

A diamond ring from a claw game in Japan is analyzed.

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

Fungal inclusions are studied in two specimens of Burmese amber.

Blue needle-like inclusions are analyzed in three quartz spheres.

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

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