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<p>[QUOTE=&quot;Bronwen, post: 2728020, member: 5833&quot;]Unless this has spent its whole life in a jewellery box, if this belonged to your fiancee&#039;s grandmother&nbsp; still looks like gold with not spots worn through to metal of a different color, it probably is gold.&nbsp; Looks pretty high karat as well.&nbsp; It is just as possible it was never marked as that the mark has worn down.&nbsp; I would expect there would be some trace if it was ever there.</p><p><br /></p><p>I don&#039;t anything you can do yourself to tell if a ruby is natural or lab grown, but the easiest test anyone can do is to look at the stone under UV light.&nbsp; Rubies are quite responsive &amp; can glow hot pink, not just reflect back purple light.[/QUOTE]</p><p><br /></p>

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