If you make a wire hangman with as small horizontal loop to put the gemstone into, you can use a small cup of water to immerse the stone in the loop. The difference in weight will allow you to calculate the specific gravity.

Make a mark on the rope part, and immerse the fixture in the water, to set your tare value. This removes the weight change of the support wire, to give you a better calculated number.

The mho tester set will help. A refractometer reading of refractive index, is the other number that really narrows it down.

A loupe is a good tool that will give you a lot of information about the stone. Lab created stones are perfect, so they show up with a loupe. I want to see some inclusions, before I buy! Even a bubble can prove it's natural....

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