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<p>[QUOTE=&quot;JewelryPicker, post: 9426640, member: 20513&quot;]15k was all but completely abandoned for the 14k standard around the 1930’s or so.&nbsp; That slight difference in gold % meant a difference in the alloy composition, resulting in slightly different oxidation over some 80-90 years.&nbsp; Add to that, being buried for how long, as mentioned.&nbsp;&nbsp; The style fits a presumed pre-1930’s piece</p><p><br /></p><p>I’d presume the odd coloration is just due to the copper content oxidizing slightly differently than we have been so accustomed to seeing with standard percentages at 10k, 14k &amp; 18k</p><p><br /></p><p>your post says the stone tested for real diamond.&nbsp;&nbsp; That’s usually a good sign that the metal is solid.&nbsp; </p><p><br /></p><p>It doesn’t ALWAYS prove true, but a good rule of thumb is:</p><p>(Generally speaking) Fake diamonds are often set in real gold, but real diamonds are never set in fake gold. </p><p><br /></p><p>the assumption is that a real diamond has a greater value than the gold that holds it.&nbsp;&nbsp; </p><p><br /></p><p>Tiny diamond chips changes that dynamic though[/QUOTE]</p><p><br /></p>

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