Strong Fluorescence in B-Jade Impregnated with Wax
A bangle is an example of the misconception that B jade is only impregnated by resin, when in fact wax-impregnated jadeite is also considered B-jade.
Nephrite Bracelet with Filled Cavity
A jade bracelet contains unusual fillers, used to create a smooth surface.
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Large HPHT-Treated Blue Type IIb Diamond
Properties of, and theories on colour zoning exhibited by, the largest HPHT-treated blue diamond graded by GIA.
Filled Pearl with Surface Features
A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
Update on Dyed Hydrophane Opal
Opal purportedly from a new deposit is found to be dyed.
Coated Beryl Imitating Emerald
Coating on a beryl demonstrates the importance of thorough examination of jewellery and gem materials.
Inclusions in Natural, Synthetic and Treated Ruby
Provides a visual guide to the internal features of natural, synthetic and treated rubies.
Yellow HPHT-Processed Rough Diamond
HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.
Treated Pink Type IIa Diamond Coloured by Red Luminescence
A type IIa colour-treated diamond was graded as Fancy brown-pink under daylight conditions and Fancy purplish grey under incandescent lighting, a colour change that resulted from HPHT annealing and irradiation.