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Cabochons of strongly zoned Brazilian quartz.
Multi-Color-Zoned Quartz from Brazil

A Brazilian quartz with unusual color zoning caused by variable iron content is examined.

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Article
GIA Gem Project
Various Gems (Olivine - Rutile)

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Article
Using LA-ICP-MS Analysis for the Separation of Natural and Synthetic Amethyst and Citrine

An exploratory investigation of the value of laser ablation–inductively coupled plasma–mass spectroscopy in identifying natural and synthetic quartz.

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Zambia Cut Citrines
Citrine from Zambia

Large, clean citrine reportedly from the Kitwe deposit in Zambia is a welcome addition to the gem market.

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Article
Citrine Quality Factors

Learn about the factors that make citrine so desirable.

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Article
Citrine History and Lore

Natural citrine is rare, and today most citrine quartz is the result of heat treatment of amethyst quartz. Even so, gems from the Victorian era have surfaced, and it’s not hard to imagine that citrine was treasured even in earlier times.

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Article
Citrine Description

Citrine—the transparent, pale yellow to brownish orange variety of quartz—is rare in nature. In the days before modern gemology, its tawny color caused it to be confused with topaz.

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The Natural Formation and Occurrence of Green Quartz

How amethyst under certain conditions may turn green rather than the expected citrine-yellow.

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