Sotheby's upcoming Magnificent Jewels auction in New York on December 11 will feature an excellent selection of natural fancy coloured diamonds. Noteworthy among these is an elegant and extraordinarity rare fancy coloured diamond pendant, which features a green-blue biolette weighing 8.81 cts. That is accompanied by a Gemological Institute of America (GIA) report and a special letter that GIA reserves for the rarest and most interesting of diamonds stating that it "not only falls into the most unusual colour grades for natural colour diamonds, but its physical properties add even more to its mystique." The reserve price for this piece, which also includes a light blue pear shaped diamond and round brilliant fancy grayish blue as well as a fancy blue marquise shaped diamond is between USD800,000 - 1,200,000.

Property from a Private American Collection Elegant And Extraordinarily Rare Fancy Coloured Diamond Pendant
Simple set in platinum with a blue-tinted pear-shaped diamond weighing approximately 0.35 carat atop a pear-shaped light blue diamond weight 1.22 carats, supporting a round brilliant fancy grayish blue diamond weighing 1.46 carats and a marquise-shaped fancy blue diamond weighing 1.44 carats, terminating in a fancy green-blue briolette diamond weighing 8.81 carats, joined by small baguette diamond links and completed by a fine platinum chain.
Est. USD800,000 - 1,200,000

Pair of Diamond and Emerald Pendant-Earrings
The pendants set with 2 pear-shaped emeralds weighing 2.85 and 3.16 carats, bordered and surmounted by clusters of 18 marquise-shaped and 14 pear-shapes diamonds weighing approximately 5.00 carats, mounted in platinum and gold. Accompanied by AGL reports nos. CS 36499 and CS 36500 stating that the emeralds are of Colombian origin; evidence of faint clarity enhancement (oil type treatment/ Canadian balsam).
Est. USD30,000 - 40,000

The crescent-shaped foliate cluster set with 20 pear-shaped and 6 marquise-shaped diamonds weighing approximately 32.25 carats, mounted in platinum.
Est. USD100,000 - 150,000

The slightly graduating row collet-set with 22 old European-cut diamonds weighing approximately 47.00 carats, spaced by delicate quatrefoil links set with 90 small round diamonds, the floret clasp centering an old-mine diamond weighing approximately 0.80 carat bordered by 10 small old-mine diamonds, the small round and old-mine diamonds weighing a total of approximately 5.75 carats, mounted in platinum, length 16 inches
Est. USD100,000 - 150,000

Sapphire and Diamond "Opera" "Brooch, Van Cleef & Arpels, Paris, Circa 1975 Designed as two joined segments of bombé from supporting flexible fringes, set with 12 oval-shaped, round and pear-shaped sapphires weighing approximately 29.00 carats, completed by 30 marquise-shaped, 40 round and 6 pear-shaped diamonds weighing approximately 23.00 carats, mounted in 18 karat gold, signed Van Cleef & Arpels, numbered 14747 SA, maker's
Est. USD 35,000 - 45,000

And accompanied by a GIA certificate stating that the radiant cut diamond's predominant colour is purple, the stone is undoubtedly one of the rarer diamonds to be seen. Sotheby's has not published its reserve price and will only provide the estimate on request. The stone is set in a platinum and pink gold ring and is flanked by two hexagonal white diamonds.
Then there is a fancy vivid blue diamond ring. Fancy Vivid Blue is the ultimate colour grading

Property of Another Owner Pair Of Emerald And Diamond Pendant- Earclips
Of modified girandole design, set with 20 pear-shaped emeralds and 288 round diamonds weighing approximately 5.00 carats, mounted in platinum.
Est. USD 12,000 -15,000

Invisibly-set Ruby And Diamond Flower Brooch, Aletto Brothers The centre set en tremblant with a cluster of 16 round diamonds weighing approximately 5.35 carats, the petals invisibly-set with numerous caliber-cut rubies, the stem set with baguette diamonds, accented with two leaves set with a total of 16 marquise-shaped diamonds, altogether weighing a total of approximately 9.75 carats, mounted in platinum and 18 karat gold, signed Aletto Bros., stem detachable. With green leather
Est. USD 125,000 -175,000

The whimsical fish decorated on the curved body with round and cushion-shaped sapphires and green garnets, the eyes of cabochon rubies, holding a red enameled starfish in its mouth, signed Tiffany, Schlumberger. A very similar fish brooch is illustrated by John Loring. Tiffany's 150 Years, pp. 166-167.
Est. USD 10,000 -15,000

The body set with an oblong-shaped citrine, completed by old European-cut, single-cut and baguette diamonds weighing approximately 1.00 carat, accented with black enamel, the eye set with a cabochon ruby, mounted in platinum, signed Cartier.
Est. USD 7,000 - 9,000

Designed as three openwork plaques of hammered gold, each set in the centre with an oval-shaped cabochon amethyst, joined by strands of round amethyst beads, the central plaque supporting a fringe of 7 emerald drops, further decorated with 40 round diamonds

weighing approximately 4.20 carats, length of top strand approximately 17 inches, signed Webb.
Est. USD 14,000 - 18,000

Property of a Florida Collector Carved Emerald and Diamond Brooch
The hexagonal emerald carved with flowers and leaves, within a frame of conforming shape and floral design set with 57 round diamonds weighing approximately 7.50 carats and 10 round emeralds, mounted in 18 karat gold, signed Van Cleef & Arpels, N.Y., numbered 1709SO.
Est. USD 25,000 - 30,000

The stylized floral spray set with 24 pear-shaped, 15 marquise-shaped. 9 round and 49 baguette diamonds weighing approximately 12.00 carats, further enhanced with 17 pear-shaped and 30 marquise-shaped emeralds, mounted in platinum.
Est. USD 15,000 - 20,000

Designed as a cluster of three mushrooms, the caps pave-set with round diamonds, the base set with pear-shaped and marquise-shaped diamonds, all weighing a total of approximately 11.25 carats, signed Tiffany & Co. With box signed Tiffany & Co.
Est. USD 14,000 - 16,000

Designed by Louis Comfort Tiffany, the pendants see wth 2 black opals of elongated oval shape, within frames designed as grape clusters and leaves, accented on the front and back with multi-colored translucent enamel and set with small round green garnets, sapphires and citrines, signed Tiffany & Co. Together with two additional gold and enamel links.
Est. USD 15,000 - 20,000

Pair of Natural Colour Baroque Cultured Pearl and Diamond Earrings

Carved Coloured Stone and Diamond Necklace and Matching Earclips
The collar formed of numerous carved ruby, sapphire and emerald leaves suspended from diamond-set vines, the center supporting articulated diamond cascades anchored by brioliette fancy coloured sapphire drops, mounted in 18 karat white gold, the matching pendant-earclips similarly decorated, the group set with numerous small round diamonds weighing approximately 8.25 carats.
Est. USD 15,000 – 20,000


Property from a Private Collection Art Deco Jade, Mother Of Pearl, Coral, Onyx And Diamond Desk Clock, Cartier, Paris, 1927

The dial composed of a circular mother-of-pearl panel depicting a pair of Chinese figures in a landscape, 19th Century, bordered by black enameled Roman numerals, within a surround formed of a mutton-fat jade ring, formerly a bangle-bracelet, late 18th Century, carved with a pair of confronting mythical dragons, black enamel side panels, completed by platinum dragon hands set with rose-cut diamonds, upon a base of black onyx decorated with carved coral and jade motifs mounted in gold, movement by European Watch & Clock Co., Inc, France, 1442. Height 4 1/2 inches.
Est. USD 80,000 - 120,000

Pair Of Cabochon Emerald and Diamond Earclips, Van Cleef & Arpels
Set with 2 round cabochon emeralds weighing approximately 9.50 and 8.20 carats, framed by scrolls of 12 round and 32 baguette diamonds weighing approximately 5.75 carats, mounted in platinum, signed Van Cleef & Arpels, numbered N.Y. 19792. Accompanied by AGL report no. CS 36482 stating that the 9.50 carat emerald is of Colombian origin; faint to moderate clarity enhancement (oil type treatment).
Est. USD 80,000 - 100,00

Pair of Amethyst and Peridot Earclips, Paolo Costagli
Designed as flowerheads, the centers set with 2 round fancy-cut peridots weighing approximately 7.75 carats, the petals with 12 round fancy-cut amethysts weighing approximately 50.75 carats, accented with 24 small round diamonds weighing approximately 1.30 carats, mounted in 18 karat rose gold, signed with maker’s mark for Paolo Costagli.
Est. USD 6,000 - 8,000