How amethyst under certain conditions may turn green rather than the expected citrine-yellow.
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Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.
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Large, clean citrine reportedly from the Kitwe deposit in Zambia is a welcome addition to the gem market.
Read MoreAn exploratory investigation of the value of laser ablation–inductively coupled plasma–mass spectroscopy in identifying natural and synthetic quartz.
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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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Citrine - the transparent, pale yellow to brownish orange variety of quartz - is rare in nature. In the days before modern gemmology, its tawny colour caused it to be confused with topaz.
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