A vintage c1940 Art Deco ring with a large hand faceted uranium glass crystal set in 19K yellow gold. Portuguese hallmarks.
Uranium glass (aka vaseline glass) is a material more common to decorative glassware than jewelry, that fluoresces a strange neon green in daylight-- owing to trace amounts of uranium in the glass. It is generally negligibly radioactive and considered harmless.
Currently a size 8 and could be resized in the 6 to 9.5 range for $75.