Article Search Results

Show Filters
Showing 345 results for "*"
Natural diamond with CVD synthetic diamond overgrowth
CVD Layer Grown on Natural Diamond

A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.

Read More

552.7 ct Yellow Diamond from the Diavik Mine
The Largest Diamond Ever Discovered in North America

GIA examines a 552.7 ct diamond from the Diavik mine in Canada.

Read More

Fancy Vivid yellow diamond
Very Large Irradiated Yellow Diamond

A very large diamond with a Fancy Vivid yellow color was identified as artificially irradiated.

Read More

Faint Green HPHT synthetic diamond
Faint Green HPHT Synthetic Diamonds

Faint green HPHT synthetic diamonds recently submitted to the Carlsbad lab owe their color to high concentrations of nickel.

Read More

Internal twin bead structures correspond to a shape like a dumbbell or peanut shell.
Freshwater Bead-Cultured Pearls with Multiple Features of Interest

GIA’s Hong Kong laboratory examines a freshwater bead-cultured pearl necklace possessing several interesting features.

Read More

This cabochon displays an unusual yellowish chatoyancy.
Chatoyant Quartz/Tourmaline Doublet

A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.

Read More

Sapphire shows a strong color change from grayish violet to purple-pink.
Low-Fe, High-V Color-Change Burmese Sapphire

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

Read More

Largest faceted gahnospinel identified by GIA.
Large Faceted Gahnospinel

Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.

Read More

Two bangles carved from manmade glass.
Glass Bangles

Bangles resembling nephrite and jadeite were not what they appeared to be.

Read More

Two synthetic sapphires displayed colors similar to Paraíba tourmaline.
Paraíba-Like Synthetic Sapphire

Two flame-fusion synthetic sapphires with a Paraíba-like color are examined at GIA’s Carlsbad lab.

Read More