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<p>[QUOTE=&quot;Ladybranch, post: 252686, member: 44&quot;]750 is .750 = 18 kt gold.&nbsp; 18/24 = 75%&nbsp; The purest gold = 24KT that is expressed in decimal form as .999 fine. There is no 100% fineness for gold for all of it has some impurities. To figure the the decimal fineness of the rest: 12/24 = .500, 14/24 =.583, etc.</p><p><br /></p><p>&quot;The decimal is found by dividing the actual caratage by 24, the most carats gold can have.&quot;</p><p><br /></p><p>I wonder if there is another hallmark above the 750 lozenge that looks like a jelly fish floating sideways?&quot; At the moment, I don&#039;t know what countries use a diamond shape lozenge (rhombus) for their gold marks.</p><p><br /></p><p>--- Susan</p><p><br /></p><p><img src="https://www.antiquers.com/attachments/dsc_0869-jpg.78039/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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