Early 20th Century Platinum Eternity Ring set with Onyx & Diamonds

This is a smart eternity platinum eternity ring that was made circa 1920 in the early Art Deco period.  It has been tramline set with alternating three square cut onyx with a diamond in between. Onyx was used a lot in the Art Deco period but is not often seen in eternity rings, so this ring is quite rare.  The sides have been engraved with detailed scroll motifs.

Please note that this ring cannot be sized.