EST VTG Cocktail Ring Teardrop Gold Tone Black Stone Rhinestone Accent Sz 8

Estate vintage jewelry box find Teardrop setting Quality cocktail ring Gold Tone - deceiving, very much looks like real yellow gold, but it is not stamped, and does have a magnetic attraction. Black stone is unknown, but looks like onyx, probably lab created onyx Rhinestone diamond-look accent Stamp is hard to make out. I think it says Taiwan. Very lovely piece! Womens sz 8