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Search Results - Gemstones, October 2018

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Swiss blue Nigerian topaz (left) | Swiss blue topaz (right)

Gemstones
Colour investigation:Topaz

Topaz has been known as a gemstone for at least 2,000 years. It occurs in a range of colours and has hardness of 8 on the Mohs scale, however it can be brittle. JENNIFER SUGGETT investigates. Read more »

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Tuesday, 26 March, 2019 06:47am
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