Art Deco Platinum Engagement Ring With 1.75-ct Diamond, Estimated $4,400 to $5,000

Concept Gallery closed its March 4, 2026 online auction with a standout lot: an Art Deco platinum engagement ring, cataloged as circa 1920s, estimated at $4,400 to $5,000. The house described an approximate 1.75-carat center diamond graded L–M color and VVS2–VS1 clarity, set in platinum and surrounded by circa-single cuts, with the lot noted in vintage condition and a ring size of 4.25.

The piece’s hallmark Art Deco profile is explicit in the catalog language: a platinum mounting from the 1920s framed by single cut stones, a configuration consistent with period halo and transition-era styles. The inclusion of circa-single cuts around the center provides visible period character and contributes to the ring’s silhouette, while the platinum construction confirms a material choice favored for its durability and for holding fine pavements during the 1920s.

The diamond specification, L–M color with VVS2–VS1 clarity and an approximate weight of 1.75 carats, is unusually precise for a vintage catalog entry yet incomplete for valuation purposes: the lot note gives color and clarity ranges but does not reference a grading laboratory or an exact carat weight to two decimals. That combination explains why Concept Gallery placed the estimate at $4,400 to $5,000; L–M color typically trades below higher-color grades, and a variance in clarity between VVS2 and VS1 introduces additional price range. The ring’s vintage condition and small modern ring size, 4.25, are also factors bidders would weigh, since resizing and restoration affect resale value.

Because the catalog entry lists descriptors rather than a lab report, responsible bidding requires confirming documentation and condition details. Verify whether the 1.75-ct measurement is certified by a recognized laboratory, ask for high-resolution photos of the table and pavilion, and request an itemized treatment disclosure, since period settings can conceal clarity or color treatments that influence price and conservation needs.

For collectors seeking Art Deco craftsmanship, the Concept Gallery lot offers an intersection of historical setting and significant carat weight, with an estimate that left room for both value buyers and repair-minded collectors at the March 4, 2026 sale. The defining takeaway is practical: a 1.75-ct center with VVS2–VS1 clarity in a platinum 1920s mounting can command a wide range of prices, so documentation and condition will determine whether the final hammer reflects a bargain or a restoration project.