Blue topaz is often sold as aquamarine and a variety of brown quartz is widely sold as topaz. The quartz is much less brilliant and more plentiful than true topaz. Most of it is variety of amethyst: that heat has turned brown.
NOTE:
topaz / tэupжz; `topжz/ n [U] transparent yellow mineral 黄玉.
[C] semi-precious gem cut from this 黄玉; 黄宝石.
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