An antique diamond and ruby pendant necklace, French, circa 1900

the openwork pendant centering a heart-shaped diamond within a calibré-cut ruby surround accented with various-shaped diamonds and completed by a drop-shaped diamond and ruby drop, suspended by a ruby and diamond collet-set chain; with French assay mark and maker's mark (indistinct); heart-shaped diamond weighing approximately: 2.20 carats; pear-shaped diamond weighing approximately: 2.00 carats; remaining diamonds approximately: 2.80 carats total; mounted in eighteen karat gold and platinum; length: 18½in. Estimate: $12,000 - 15,000

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Bonhams.  Fine Jewelry, 14 Oct 2008. San Francisco, Los Angeles and New York - www.bonhams.com