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The wax-impregnated bangle (left) showed bluish fluorescence under long-wave UV.
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.

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Two white jade bracelets with dark color patches.
Nephrite Bracelet with Filled Cavity

A jade bracelet contains unusual fillers, used to create a smooth surface.

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These rubies were determined to be glass filled, partly due to the use of the DiamondView.
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.

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HPHT-treated blue diamond (left) with ragged-looking graphitization around an inclusion (center) and high-order interference colors with crossed-polarizing filters (right).
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.

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This 20.60 ct specimen was purchased by the client as a “natural white pearl.”
Filled Pearl with Surface Features

A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.

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These two opals were represented as natural-color blue and pink opal from Mexico.
Update on Dyed Hydrophane Opal

Opal purportedly from a new deposit is found to be dyed.

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Top: The drilled green briolettes. Bottom: Fluid inclusions, crystals, and two-phase inclusions.
Coated Beryl Imitating Emerald

Coating on a beryl demonstrates the importance of thorough examination of jewellery and gem materials.

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Micro-Features of Ruby
Inclusions in Natural, Synthetic and Treated Ruby

Provides a visual guide to the internal features of natural, synthetic and treated rubies.

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HPHT-processed yellow rough diamond.
Yellow HPHT-Processed Rough Diamond

HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.

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4.29 ct color-treated Fancy brown-pink diamond
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.

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