Marks: "TIFFANY & CO 18K SCHLUMBERGER" Stamped on the reverse

The stone is held securely in place by a simple four-prong design

and would also make a stunning anniversary piece

this solitaire-style ring makes a timeless statement

A sophisticated statement piece featuring a luminous newly set green tourmaline at its heart

Antique 1920s Elongated Onyx White Gold Ladies Ring Base Metal Pin Marks: "TIFFANY & CO 18KA striking antique ring from the 1920s, this piece features an elongated onyx stone, newly set in lustrous 14 karat white gold. The elegant oval cut and refined metalwork exemplify the sophisticated design sensibilities of the Art Deco era, making it a timeless addition to any fine jewelry collection. Metal: 14K White Gold Gem: Black Onyx Gem Measurements: 9. 9 x 17. 6 mm, Oval Cut Ring Size: 4. 25