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<p>[QUOTE=&quot;Hollyblue, post: 360245, member: 1496&quot;]Unless the stone has been tested by a reputable lab like GIA,etc. few people know if a stone is heat treated or not.For over a thousand years rubies and sapphires have been heat treated at the mines and gone through many hands before the stone cutters.</p><p><br /></p><p>Heat treatment history......&nbsp; <a href="http://www.ruby-sapphire.com/brief-history-heat.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ruby-sapphire.com/brief-history-heat.htm" rel="nofollow">http://www.ruby-sapphire.com/brief-history-heat.htm</a>[/QUOTE]</p><p><br /></p>

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