Exceptional Mid-Century 18K Gold & Platinum Coral, Blue Zircon and Diamond Convertible Brooch Pendant | Estate Jewel

An exceptional and unusually large mid-century jewel, this convertible brooch pendant exemplifies the bold scale and refined craftsmanship characteristic of important estate jewelry from the mid-20th century.

The design is masterfully executed in rich 18K yellow gold with platinum settings, centering an impressive natural salmon coral cabochon of elongated oval form. Measuring approximately 30.0 mm x 9.97 mm, the coral displays a beautifully even hue and a smooth, luminous surface—attributes increasingly difficult to find in coral of this size and quality.

Encircling the coral is a dramatic halo of oval-cut pale blue zircon gemstones, with a combined estimated weight of approximately 16.00 carats. The zircons are notable for their generous proportions and exceptional brilliance, creating a vivid contrast against the warmth of the coral and gold. Zircon of this caliber and scale is seldom seen in contemporary jewelry, making this an especially distinctive feature.

Adding further refinement are round brilliant-cut diamond accents, totaling approximately 0.90 carats, predominantly G–H color with VS clarity. The diamonds are set in platinum, enhancing their brightness and lending a crisp elegance to the overall composition.

Designed with versatility in mind, the piece is fitted with both a secure pin stem with safety clasp and a concealed bail, allowing it to be worn as either a brooch or a pendant. The jewel is stamped “18K” for gold purity and has a substantial weight of 18 grams, underscoring its quality and presence.

Details:

Metal: 18K Yellow Gold & Platinum

Center Stone: Natural Salmon Coral Cabochon

Coral Dimensions: approx. 30.0 mm x 9.97 mm

Accent Stones:

Blue Zircon: approx. 16.00 carats total

Diamonds: approx. 0.90 carats total

Diamond Quality: G–H color, VS clarity (approximate)

Dimensions: approx. 7/8" wide x 1 3/4" long

Weight: 18 grams

Era: Mid-20th Century

Condition: Very fine vintage condition, consistent with age

This is a rare and visually commanding estate jewel, created at a time when exceptional materials and bold design were prioritized over economy. Pieces of this scale and gemstone quality are increasingly scarce, making it a standout acquisition for the discerning collector of fine vintage jewelry.