New vintage egg cocktail ring

New vintage egg cocktail ring UNIQUE, different and ugly beautiful! Jolie laide! I’ve always thought of this as an egg ring because of the speckles and oval shape. Black matrix with white grey speckled inclusions / spots. It looks like snowflake obsidian but I’m not sure. It’s quite opaque. Polished but not glassy. I was told it’s a semi precious gemstone. I’m not sure if it’s natural or manmade. 12x19 mm, 6 mm tall 4 large gold tone prongs 8 mm 2 mm deep setting, 5 mm deep gallery with 2 loops and 4 swirls: looks like a stylized fleur-de-lis. Art nouveau - Art Deco. Almost 3 mm wide simple gold tone band. Size 7.5 New vintage c. 1970s. Made in Korea. Genuine stone (synthetic or natural). No visible Hallmark. Most of these rings say “NICCOP”. Not solid gold. Very good costume or gold plate.