Posted 6 years ago
Found this test accidentally :-D
Internet is not very clear about it, but I think it is an easy trick, at least to sort glass or garnets from ruby variety of corundum!
You can see how the clasp of my chrysoprase necklace react! I knew these red stones weren't natural rubies, but thought they were paste stones. SYNTHETIC RUBIES!
For the butterfly, an old spare piece in wait of proper use, you can see all red stones aren't rubies: those which don't react to UV are garnets, others are natural rubies (I know that from the era of the piece and the cut of stones!)