Vintage Unique Shape Tiger's Eye Sterling Silver Ring Size 5.5 Boho Free Form

Vintage Sterling Silver Statement Unique Ring Preowned ring with no markings on the ring for purity or maker. I don't know what the stone is. I thought maybe a type of bicolored quartz but couldn't find an exact one with the tiger's eye mix of colors. One side is clear with some black specs and the other is a mix of brown and yellow. There are some scratches on the surface of the sterling but overall in good condition. I tested the stone with my Presidium Gem Tester II machine and it reads a little bit above the glass line so it's not glass but I am not sure what it is. Please note the Gem Tester does not distinguish between lab grown gems and ones found in the earth which are chemically the same. Please see pictures for details. US Size 5.5 6.5 grams Oval gemstone is 20.5 mm x 14.6 mm x 3.2 mm Please note that color may vary a small amount because of my lighting. If you have questions please ask and I would be happy to help! -Michelle