Dating to the first or second decade of the twentieth century, this delightful brooch by Black, Starr and Frost centers on a magical 25 carat opal gumball filled with a dazzling array of colors. Flecks of neon green, lilac purple and electric blue are washed with splashes of iridescent yellow, creating a spectacular play-of-color. The elegant shield-shaped frame has been intricately hand fabricated in platinum, accented with .70 carats of glittering old cut diamonds. Accompanied by a gemological report from GIA stating: natural opal.
Measurements: 37 x 28 mm wide
Opal: estimated 25 carats, 19.70 x 19.90 x 11.51 mm
Diamonds: estimated .70 total carats of old cut diamonds
Weight: 12.2 grams
Markings: BS&F indicates the American jeweler Black, Starr & Frost
Notes: Founded in 1810 by Isaac Marquand – Black, Starr & Frost opened as Marquand & Co. at 164 Broadway in New York City, making it the oldest continuously operating jewelry firm in the United States. At that time, two store clerks – William Black and Henry Ball – eventually joined the firm, which became Black, Ball & Company. In 1912, then named Black, Starr & Frost – their offices to the southeast corner of Fifth Avenue and 48th Street.