Diamond ring, a diamond brooch, 19th century, and a diamond brooch, circa 1910

The ring set with an oval diamond, between shoulders of rose-cut diamonds, size I 1/2, one diamond deficient, possible French assay mark; the oval brooch of openwork design set with rose-, circular-cut and cushion-shaped diamonds, French import mark; the brooch of bow design set throughout with rose-cut diamonds, French import mark.