Step 3: Practical Gemology
Using a balance scale for specific gravity testing is the technique recommended by the International Gem Society. You can adapt or create your own scale or purchase the Hanneman Specific Gravity Scale from Amazon.
Almost any balance-type scale can be adapted for this. All you need to do is find a way to submerge one pan in water. If you look in your cupboard you will certainly find something that will suit this purpose. …
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