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<p>[QUOTE=&quot;InfleXion, post: 1350347, member: 29012&quot;]In light of all the fakes going around lately I decided to look into tests further, and there is a specific gravity test you can do that is pretty foolproof. Ultimately you&#039;ll want to know diameter and thickness measurements, but the specific gravity test will catch most fakes. You can look up videos on YouTube for examples, but I will briefly explain.&nbsp;&nbsp; </p><p><br /></p><p>First, weigh your coin or bar, and mark it down, preferably using a gram scale to 2 decimal places, but 1 place works.</p><p><br /></p><p>Next, get a plastic cup and fill it with enough water to submerge your coin, and zero out the scale with the cup on it.</p><p><br /></p><p>Lastly, wrap some floss around your coin so you can suspend it, then lower it into the cup completely below the water&#039;s surface so it&#039;s not moving and not touching the sides or the bottom, and record that weight. </p><p><br /></p><p>You could also weigh the cup with the water instead of zeroing it out, then weigh the cup with the water and the coin, and subtract the difference.&nbsp;&nbsp; </p><p><br /></p><p>Either way, divide the actual coin weight by the weight difference you get by placing the coin into the water, and this will give you specific gravity.&nbsp;&nbsp; </p><p><br /></p><p>Specific gravity for platinum is 21.37. For gold it&#039;s 19.32, and silver it&#039;s 10.492. The silver coins I tested this on came out to be 10.333 and 10.4, close enough to be legit. Actual weight of 31.0 and 31.2 grams, again close enough.[/QUOTE]</p><p><br /></p>

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