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Search Results - Gemstones, May 2013
your search of 'Gemstones, May 2013' has 2 results.
23/05/2013
China has made many advances in technology across numerous fields and
over the past 800 years or so the Chinese have been improving their
methods for growing cultured pearls.
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02/05/2013
There have been more developments in gemstone treatments in the past 15
years than in the previous 50, and many of these concern sapphires and
rubies.
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