This is another hobby I've developed recently, coinciding with people redeeming jewelry for spot metal prices.
In the process, the stones in the jewelry are being discarded by coin dealers--basically anything that doesn't test quickly as diamond.
It must be all
colored glass set in 18K--right? Luckily, a friend is catching the discards for me, sending them my way.
It's handy that I have the lab equipment and time to make an analysis.
The "glass" stone below is a natural sapphire, probably from Australia due to internal structure. It's about 1.5ct.