Research Article Search Results

A bluish green translucent mineral is identified as aquamarine in a large pegmatite plate from Minas Gerais, Brazil.

Gemologists test a group of freshwater cultured pearls with rare colors ranging from deep purple to orange-red.

Needle-like hematite and rutile inclusions are identified in two six-rayed star quartz specimens.

A unique specimen of turquoise with yellow raindrop-like patterns is examined.

The gemological community mourns the loss of gem photography pioneer Harold Van Pelt.

Examines the gemological properties of red and orange spinel from Mogok, Myanmar, and Lang Chap and An Phu in Vietnam, using trace element chemistry to evaluate geographic origin.

Atypical absorption spectral features are observed in a natural pear brilliant diamond previously submitted as rough to GIA.

The Mumbai laboratory reports on a unique carved natural diamond set with two Zambian emeralds.

Examination of an extraordinarily large bead cultured pearl reveals an unusual internal structure characterized by widely spaced concentric nacre layers separated by translucent organic material.

The Bangkok laboratory documents the first reported discovery of microscopic marine organisms observed in South Sea cultured pearls at GIA.

A heat-treated Sri Lankan sapphire exhibits a rare reversible color change from very light blue to light yellow after short-wave UV exposure.

A purplish red oval mixed cut submitted as a ruby was recently identified as heat-treated spinel at the Hong Kong laboratory.