French Art Deco / Boivin (attr.) / Strekers, 11 rue de Pyramides 75001 Paris (maker’s mark) “Fan Shape” clip / brooch, 18K gold with fancy hard and baguette cut citrines and a large cabochon ruby (6.50 carats), marks c. 1938
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
French Art Deco “Heptagon” clip / brooch set with a large fancy cut madeira citrine and 8 baguette madeira citrines all set in 18K gold, signed, c. 1935
French Art Deco “Heptagon” clip / brooch set with a large fancy cut madeira citrine and 8 baguette madeira citrines all set in 18K gold, signed GA in a diamond French touch mark, French Eagle’s head mark for 18k gold, c. 1935
French 19th Century light yellow natural color diamond (approx. 2.20 carats TW, G.I.A certificate, 8.05 x 6.90 x 5.05mm, natural diamond) ring set in a fancy 18K yellow gold mounting, signed, numbered 3056, c. 1890
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.
French 1950’s “Turban Style” ring, large pearl (G.I.A. certificate, Weight of the pearl: 16 grams, bead cultured pearl, saltwater, drop shape, white color, “Orient” overtone) and fancy diamond ring set with two triangle diamonds (approx. 2 carats TW) and 48 round diamonds (approx. 8 carats TW) all set in platinum, signed
Champagne “Mughal” Diamond ring, Round rose cut fancy light to fancy brownish yellow natural color center diamond (G.I.A. certificate, 5.50 carats) encircled with 12 old mine cut brilliant diamonds (G.I.A. certificate, near colorless approx. 8 carats TW) and 12 small round old mine cut diamonds all set in white and yellow gold, mid 19th Century
American “Night & Day” pendant earrings, two black pearls suspended from fancy detachable pendants with a bow motif earrings all set in platinum with approx. 134 round diamonds and four baguette diamonds (approx. 8 carats TW), c. 1935
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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