Price guide to antique and vintage platinum and diamond brooches.Archaeologists have discovered traces of platinum in the gold used in ancient Egyptian burials as early as 1200 BC. However, the extent of early Egyptians’ knowledge of the metal is unclear. It is quite possible they did not recognize there was platinum in their gold.
The metal was used by pre-Columbian Americans near modern-day Esmeraldas, Ecuador to produce artifacts of a white gold-platinum alloy. They employed a relatively sophisticated system of powder metallurgy. The platinum used in such objects was not the pure element, but rather a naturally occurring mixture of the platinum group metals, with small amounts of palladium, rhodium, and iridium. Reference: Wikipedia
Below are some examples of platinum and diamond brooches including a diamond brooch circa 1910 and a diamond brooch designed as a stylized scroll.
A diamond brooch, circa 1910
The openwork oval plaque millegrain-set throughout with old brilliant, single and rose-cut diamonds, mounted in platinum, diamonds approx. 1.20cts total, width 4.2cm
Sold for £937 inc. premium at Bonhams in 2018
DIAMOND AND PLATINUM BROOCH
Designed as a stylized scroll composed of marquise and baguette-cut diamonds, centering on larger marquise diamond
Metal: Platinum
Larger Marquise Diamond: weighing approximately 1.25 carats
Smaller diamonds: 44 diamonds weighing approximately 4.50 – 6 carats
Size/Dimensions: 5.4 x 2.5 cm
Marks: PT 950
Gross Weight: 14.5 grams
Sold for USD 4750.00 at Christies in
Platinum and Diamond Brooch, France
The stylized bow centering one round diamond approximately .90 ct., within a cluster of 28 round diamonds approximately 10.00 cts., tipped by 7 marquise-shaped diamonds approximately 2.00 cts., within ribbons of 90 baguette diamonds approximately 9.75 cts., signed Albuquerque, Monte-Carlo, Paris, with French assay marks, approximately 23.7 dwts.
Round diamonds: G-H-several I-J-VS, several SI.
Marquise-shaped diamonds: H-J-VS.
Baguette diamonds: H-I-VS.
Good condition. Well-made. 2 3/4 x 2 1/8 inches.
Sold for $17,500 (includes buyer’s premium) at Doyle New York in 2018
Platinum approx 11.00 carat Diamond Brooch. Antique Style. VS. F-G Color.
Sold for $4,400 at Joshua Kodner in 2018
A Diamond Cluster Platinum Brooch. Crafted in platinum, set with pear-shape and marquise-cut diamonds weighing a total of approximately 20.00 carats, with H-J color and SI-I clarity; fastened with a single pin stem and catch; measures 1-1/4 x 2-1/2 inches; weight 26.40 g.
Stamped: PLAT
Sold for $8,500 at Fortuna Auction in 2018
Diamond Brooch
of geometric design, centring on a bullet-shaped diamond, decorated with old European-, single- and step-cut diamonds, mounted in platinum.
Sold for 81,250 HKD at Sothebys in 2018
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