c. Early 1900s Ostby & Barton Solitaire Engagement Ring with an Old European Cut Diamond

Period: c. early 1920s post-Victorian solitaire

Maker: The piece is stamped “O 10K B” alongside a Maltese cross. The maker’s mark is that of jewelry manufacturer Ostby & Barton Company from Providence, Rhode Island (established July 1, 1879). Englebart Ostby was a renowned jeweler who trained at the Royal School of Art in Norway. His jewelry company was a highly regarded ring manufacturer of the era. Yet Ostby would never witness the extent of his company’s success, as he was among those who lost their lives in the sinking of the Titanic in 1912. His daughter, Helen, who was also a passenger, survived. Helen and Ostby’s brother, Harold, became joint owners of the company in 1914, and the company continued production until c. 1950.

Materials: 10K gold; diamond

Dimensions: the diamond measures 5.31 mm in diameter at its widest point; the piece stands 4.60 mm tall above the finger

Size: 6 1/4 (free sizing)

Diamond: GIA-assessed .52 carat Old European Cut diamond with L color and SI2 clarity


Item Q3492