Research Article Search Results

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.

Vivid red to orange-red realgar inclusions are observed in a contact-twinned calcite host.

A mabe pearl exhibits an unusual pattern of intersecting subsurface channels, likely formed by shell-boring parasites.

Microscopic examination of a non-nacreous natural pearl reveals a distinctive pattern resembling leaves with intricate vein structures.

Several natural pearls in a multistrand necklace display an unusual reticulated surface texture with deep indentations and prominent ridges.

Microscopic examination of a Pakistani peridot reveals a rare cylindrical fluid inclusion with a freely moving gas bubble.

Thin-film decrepitation inclusions create a colorful scene in a beryllium-diffused orange sapphire.

Numerous Rose channels against a backdrop of scattered zircon crystals produce a striking night-sky effect in a color-change sapphire.

The first known occurrence of a vesuvianite inclusion in sapphire is documented.