American Art Deco rectangular onyx ring with a diamond center stone (approx. 1.5 carat TW) and further set with 12 round diamonds on the side shanks, platinum mount, c. 1930
Rene Boivin, Paris, “Art Moderne” ring set with an oval sapphire (approx. 2+ carats TW) and further set with 22 tapered and full sapphire baguettes (approx. 3 carats TW) and 18 round cut diamonds (approx. 2+ carats TW) all set in a streamlined and contoured platinum mount, signed, certificate, c.1930’s
Boucheron Paris, Moderne ring set with a step cut square citrine (approx. 8 carats TW) and contoured bone details on either side all set in a solid 18K gold mount, signed, c. 1970’s
American Art Deco ring set with a large gem quality emerald step-cut aquamarine (approx. 15 carats by calculation with the dimensions of 17mm x 13mm x 10mm depth) and 10 round cut diamonds (approx. half of a carat TW) all set in a platinum “Bow tie” design mount, signed: FFF framed with a triangle facing in on either side (maker’s mark), Plat (platinum mark), c.1935
Art Deco cushion shape natural Burmese sapphire ring (approx. 7 carats TW, G.I.A. certificate, no heat) set in an intricate platinum mount with 4 baguette diamonds and 16 round diamonds (approx. 4 carats), c. 1930
Art Deco cushion shape natural Burmese sapphire ring (approx. 7 carats TW, G.I.A. certificate, 10.00 x 9.70 x 8.00mm, no heat) set in an intricate platinum mount with 4 baguette diamonds and 16 round diamonds (approx. 4 carats), c. 1930
Cartier Art Deco brooch, carved rock crystal with a fancy platinum mount set with diamonds, original leather box, signed c. 1925
Cartier Art Deco brooch, carved rock crystal with a fancy platinum mount set with two European and cushion cut diamonds (approx. 3 carats TW) further set with two European and cushion cut diamonds (approx. 1 carat TW) with diamond pave work filling out the surrounding floral motif, original leather box, signed and numbered, c. 1925
Mappin & Webb Art Deco / Modernist diamond brooch (84 count approximately 14 carats TW), further set with fully faceted onyx and emeralds with a central square synthetic emerald all set in an elaborate platinum mount, c.1930
French 19th Century “Gothic Revival” ring set with a very fine square step cut emerald (approx. 2 carats TW) and two European rose cut diamonds (approx. 2 carats TW) all in an openwork 18K yellow gold mount further set with 12 old mine cut diamonds, signed, c.1885
Lacloche Freres, Paris (attr.) Tutti Frutti “Bouquet of Flowers” ring set with two Mughal carved sapphire flower/leaf shaped jewels and further set with a matching cabochon sapphire, 11 baguette diamonds, 22 round cut diamonds and two golden hued pearls all in a very intricately detailed platinum mount, c.1920’s
French Art Deco Interlocking ring, Invisibly set rectangular sapphires (10 count, approx. 2.50 carats TW), pave diamonds (approx. 2.50 carats TW) all set in a platinum mount, c. 1935
American Art Deco ring (likely by Louis C. Tiffany for Tiffany & Co.) set with a large blue zircon (approx. 64 carats by calculation, 20mm x 20mm x 19mm) set in a fancy platinum mount further set with 14 round cut diamonds, four bullet shaped gold/orange citrines and two kite shaped gold/orange citrines, marked: very deeply stamped letters as a maker’s mark on the inside of the shank, c. 1930
***Top quality gem blue zircons over 10 carats trade at a minimum price of $200 per carat and go up from there depending on the size of the stone and the quality of the color. Blue zircon, the most popular color, is produced by heat treatment of brown zircon. But not all brown zircon will turn blue when heated; only some zircon has the right physical structure for this to occur. This is why most blue zircon comes from certain sources in Cambodia or Burma. Blue zircon is a reasonably hard gem with a Mohs hardness of about 7 to 7.5. Blue zircon has some unique properties that make it very popular with gemstone aficionados. Not only does zircon have outstanding brilliance, but it also has very strong dispersion or fire, the tendency to split white light into the spectral colors. Zircon also has very pronounced birefringence or double refraction, with a wide variance between the two refractive indices. This can be often be observed with the naked eye when you look down through the table of a cut zircon; you will observe facet doubling that makes the facet edges appear blurred.
Neil Lane solitaire “Cognac” orange/brown diamond ring (1.87 carats natural color, GIA certificate) set in a double loop through design all in 18k gold with micro pave work throughout, signed, c.2006
French Art Deco Diamond and sapphire ring, Round rose cut diamond (approx. 3 carats) set with sapphires (approx. 1.5 carats TW) in a platinum mount, signed, c. 1930
French Art Deco ring set with a fine jadeite oval cabochon, faceted and caliber cut onyx, and further set with 18 round diamonds and six square French-cut diamonds all set in a millegrain platinum mount, c. 1920’s
Edwardian cluster ring set with a natural Saltwater pinkish brown pearl (G.I.A. certificate) and 28 diamonds (approx. 7 carats TW) set within a silver topped gold mount, c. 1890’s
American Arts & Crafts ring, detailed and scrolling 14K gold mount with stylized leaves and blossoms surrounding a large cabochon amethyst (approx. 22+ carats TW), marked, c. 1915
European pear shape clip earrings set with large mabe pearls, contoured onyx all in a yellow gold mount and further set with four round cut diamonds, marked, c.1980’s
Edwardian Era elaborate pendant necklace with a large fancy round-cut natural gem Madeira citrine (approx. 30 carats TW dimensions 20mm x 20mm x 16mm, GIA certificate) in a fine milligrain platinum mount with stylized leaves and flower blossoms and a bow all set with 83 old European round-cut diamonds (approx. 4.65 carats TW) suspended from the matching and period platinum chain, c.1900
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