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<p>[QUOTE=&quot;Bronwen, post: 5921997, member: 5833&quot;]If my memory serves, synthetic red corundum was developed in the late 1800s &amp; became available on the market, mainly for use in watches because the stones were small, in the early 1900s.&nbsp; It took some more years before they figured out how to make blue.&nbsp; I have yet to come across a more accurate date for blue sapphire.&nbsp; A lot of this work was being done in the USSR, so maybe there are Russian language accounts of their development that Google does not show this English speaker.&nbsp; This is what I recall from reading I did trying to get a handle on color change stones.[/QUOTE]</p><p><br /></p>

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