Retro Era Diamond and Two-Tone Gold Tubogas Style Ring

This is a highly stylized cocktail ring from the Retro Modern period, likely dating to the late 1930s or 1940s. The piece is constructed from two-tone metal, featuring a dominant 14k or 18k yellow gold foundation accented with white metal, most likely platinum or white gold, in the central setting. The design is architectural and bold, characteristic of the 'Machine Age' aesthetic, utilizing a 'Tubogas' or gas-pipe inspired ribbed texture on the yellow gold shoulders. The central vertical bar is pavé-set with approximately 10 to 12 small round-cut diamonds, which appear to be single-cut or early brilliant-cut stones commensurate with the era. The shank of the ring is unique, featuring an open-work, chain-link or scalloped design rather than a solid band, suggesting a high level of custom craftsmanship. The condition shows light surface wear and minor scuffing on the yellow gold surfaces, consistent with age and occasional wear. There is no visible sign of resizing or major repair. The use of mixed metals and the voluminous, 'ribbed' industrial motif are hallmarks of high-end jewelry from this period, reflecting a shift toward bold, sculptural forms during the wartime and post-war years.