Vintage costume jewelry brooch with dark & light blue and rhinestones in dome shape

This style of dome-shaped rhinestone brooch was particularly popular during the 1950s and 1960s, when costume jewelry reached its creative peak. Manufacturers used prong-set glass rhinestones in various shades of blue combined with aurora borealis (AB) coated stones that reflected rainbow colors, creating eye-catching dimensional pieces. These brooches were often worn on coat lapels, dresses, or hats as statement accessories during the mid-century modern era. Vintage rhinestone brooches remain highly collectible among costume jewelry enthusiasts and vintage fashion collectors who appreciate the craftsmanship and sparkle of mid-century designs. The dome or cluster configuration, featuring graduated sizes of stones, demonstrates the technical skill of the era's jewelry makers. Collectors particularly value pieces with intact stones, secure settings, and the distinctive aurora borealis finish that became a hallmark of 1950s-60s costume jewelry.