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<p>[QUOTE="HMB, post: 378660, member: 7939"]Good to know.</p><p><br /></p><p>Another from Facebook suggested that the lozenge/diamond mark indicates plumb gold on PPT assay marks, such as the 'KP' marks used in the USA to indicate plumb.</p><p><br /></p><p>He said it has been around since at least the 1920's and believed it was started in Israel. What are your thoughts on Israeli origin?</p><p><br /></p><p>No signs of the same mark but there are some similar styles here, based in Jerusalem:</p><p><a href="https://www.rubylane.com/shop/thegryphonsnest/ilist/?q=onyx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.rubylane.com/shop/thegryphonsnest/ilist/?q=onyx" rel="nofollow">https://www.rubylane.com/shop/thegryphonsnest/ilist/?q=onyx</a>[/QUOTE]</p><p><br /></p>
[QUOTE="HMB, post: 378660, member: 7939"]Good to know. Another from Facebook suggested that the lozenge/diamond mark indicates plumb gold on PPT assay marks, such as the 'KP' marks used in the USA to indicate plumb. He said it has been around since at least the 1920's and believed it was started in Israel. What are your thoughts on Israeli origin? No signs of the same mark but there are some similar styles here, based in Jerusalem: [URL]https://www.rubylane.com/shop/thegryphonsnest/ilist/?q=onyx[/URL][/QUOTE]
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