Suggested Reading on Sapphires and their Inclusions

Suggested Reading on Emeralds and their Inclusions

Suggested Reading on Diamond Inclusions

Examination of a faceted rock crystal backed by a slice of turquoise—an obvious but unusual combination of gem materials.

A summary of the article “A simple approach to separate natural from synthetic ametrine,” by Francine Payette.

This section, from the Winter 2011 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

Specimens presented as rubellite tourmaline rough are found to be resin imitations with lead inserts.

Trigonal cinnabar inclusions are identified in a crystal cluster of fluorite and calcite.

Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.

A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.

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.

The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.

Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.

A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.

There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.

ここでは、スパイラルカット用のゴム型の作成方法について説明します。

Eye-visible inclusions are common in almost all quartz varieties except rose quartz.

ベンチピンの変更のための人間工学的なヒントについての記載です。

The Anahí mine in southeastern Bolivia has enjoyed consistent production since 1990 and is best known for its ametrine.