Vintage Gothic style handmade yellow tone ring with blue turquoise like insert

Vintage handmade Gothic style ring. Size 7.75. Not stamped. Possibly yellow tone solid brass. In like new condition. Some residual metal flakes are still there, as shown in pictures under x20 magnification. With blue insert that looks like a natural turquoise stone, but may also be art glass (but for sure not plastic and not enamel).