An important diamond rivière necklace

An important diamond rivière necklace comprising a graduated line of fifty-one round brilliant-cut diamonds, weighing 7.19, 5.06, 5.00, 3.41, 3.40, 3.27, 3.25, 3.16, 3.12, 2.35, 2.27, 2.21, 2.02, 2.00, 1.70,1.65, 1.40, 1.30, 1.29, 1.28, 1.25, 1.12, 1.06, 1.02, 0.80, 0.75, 0.75, 0.75, 0.72, 0.72, 0.71, 0.70, 0.70, 0.70, 0.70, 0.64, 0.61, 0.61, 0.60, 0.58, 0.57, 0.57, 0.55, 0.54, 0.53, 0.52, 0.52, 0.52, 0.38, 0.34 and 0.31 carat, joined by a heart-shaped clasp, weighing 2.04 carats; total diamond weight: 79.20 carats; mounted in platinum; length: 15 3/4in. Estimate $1,400,000-1,800,000 (€1.3 million - 1.6 million). Photo: Bonhams.

NEW YORK, NY.- On June 22 Bonhams will hold its Fine Jewelry sale in New York that will be led by an important diamond rivière necklace estimated at $1,400,000-1,800,000. 

The stunning diamond rivière necklace features Triple X-cut diamonds that are of the highest cut, polish and symmetry grade. The graduated line of fifty-two round brilliant-cut diamonds weigh over 70 carats that are joined together by a heart-shaped clasp. 

A luscious pink diamond and diamond ring is a star lot, which is estimated at $600,000-800,000. The cut-cornered, rectangular-cut fancy intense pink diamond weighing 3.56 carats is set within a pear-shaped diamond surround. It is further enhanced by a pavé-set diamond surround and mounted in 18k white and yellow gold. 

A fancy colored diamond and diamond ring

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A 3.56 carats Argyle  cut-cornered rectangular-cut fancy intense pink diamond and diamond ringEstimate US$ 600,000 - 800,000 (€550,000 - 730,000). Photo: Bonhams.

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set with a cut-cornered rectangular-cut fancy intense pink diamond, weighing 3.56 carats, within a pear-shaped diamond surround, further enhanced by pavé-set diamond surround, gallery and shoulders; estimated remaining diamond weight: 3.70 carats; mounted in 18k white and yellow gold; size 6 

Accompanied by GIA report #1172014414, dated February 19, 2015, stating the diamond as: fancy intense pink color, SI1 clarity.

The color pink is hailed as one of the rarest to be found in diamonds. Most pink diamonds come from one mine in the world: the Argyle diamond mine in the remote north of Western Australia, the world's largest producer of natural colored diamonds. 

Remarkably, only 5% of diamonds mined from Argyle are of gem quality, and less than 1% of those are pink. Every one million carats of rough diamonds mined typically yields only one carat of gem-quality pink diamond.

Even more rare are the highly saturated pink diamonds which are graded as 'Intense' or 'Vivid' and those that are over 1ct are truly scarce. Pure pinks are more popular and rare than diamonds that are modified by purple, orange or brown hues.

The Argyle mine is expected to continue producing diamonds until 2020 but, with no other significant pink diamond mines elsewhere in the world, the demand for these alluring pink gemstones far exceeds the supply.

Examples of blue and yellow diamonds include a striking ring designed as a pavé-set diamond star with an oval modified brilliant-cut fancy deep blue diamond in the center, which weighs 0.71 carat (est. $250,000-350,000); and a yellow diamond ring (est. $50,000-60,000) that features a cut-cornered square modified brilliant-cut fancy yellow diamond weighing 5.02 carats flanked by fancy-cut diamonds within a pavé-set diamond surround. 

A fancy colored diamond and diamond ring

An oval modified brilliant-cut fancy deep blue diamond and diamond ringEstimate US$ 250,000 - 350,000 (€230,000 - 320,000). Photo: Bonhams.

designed as a pavé-set diamond star, centering an oval modified brilliant-cut fancy deep blue diamond, weighing 0.71 carat; inscribed 'Margaret"; mounted in oxidized 18k white gold; size 5 3/4

Accompanied by GIA report #13158478, dated October 22, 2014, stating the center diamond as: fancy deep blue color, SI1 clarity.

A fancy yellow diamond and diamond ring

A 5.02 carats cut-cornered square modified brilliant-cut fancy yellow diamond and diamond ring Estimate US$ 50,000 - 60,000 (€46,000 - 55,000). Photo: Bonhams.

set with a cut-cornered square modified brilliant-cut fancy yellow diamond, weighing 5.02 carats, flanked by fancy-cut diamonds, within a pavé-set diamond surround; estimated remaining diamond weight: 1.20 carats; mounted in 18k white gold; size 7 

Accompanied by GIA report #6177055515, dated February 27, 2015, stating the diamond as: fancy yellow color, VS1 clarity.

Susan Abeles, US head of jewelry at Bonhams, comments on the desirability of colorful jewels, “This sale is packed with beautiful colored stones and important pieces of wearable jewelry that have, time and time again, proven their worth in the saleroom.”  

Strong examples of colored gemstones include:  

An important 25 carat sapphire and diamond ring (est. $400,000-500,000) by M. Gerard, a famous French jewelry house known for its superior craftsmanship and superb gemstones. The richly colored crystal sapphire’s unusual octagonal cut makes this a very rare find. The sapphire is flanked by triangular-cut diamonds and is mounted in 18k gold. 

A fine sapphire and diamond ring, M

A fine 25.38 carats octagonal step-cut Ceylon  "Royal Blue" sapphire and diamond ring, M. GérardEstimate US$ 400,000 - 500,000 (€370,000 - 460,000). Photo: Bonhams.

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set with an octagonal step-cut sapphire, weighing 25.38 carats, flanked by triangular-cut diamonds; signed M. Gérard, no. 3290; estimated total diamond weight: 1.80 carats; mounted in 18k gold; size 5 1/4

Accompanied by Gübelin Gem Lab report #0703243, dated March 28, 2007, stating the sapphire as: Sri Lanka (Ceylon) origin, no indications of heating, "royal blue"

Accompanied by AGL report #CS 67998, dated May 14, 2015, stating the sapphire as: Classic Ceylon (Sri Lanka) origin, no indications of heat or clarity enhancement.

The magnificent sapphire in this ring exhibits a vivid saturation with a perfect balance of light, in a well formed crystal. Such a stone is rare, and was chosen for these ideal and pure attributes by Louis Gérard, previously of Van Cleef & Arpels. Graded as the best and most classic "Royal Blue" color by Gubelin, this stone is the ideal example of the finest quality sapphires from Ceylon; it is unusual for its size, octagonal cut and captivating, rich color.

In 1968, Louis Gerard founded M. Gérard, a French jewelry house which, during the twenty years of business was recognized for its notable creations which were characterized by superb manufacture, minimal use of metal and superior quality specimen gemstones. This ring reflects the sensitivity and superb craftsmanship that exemplifies the few surviving creations from this short lived, but famous jeweler.

A fancy colored diamond and sapphire ring (est. $40,000-60,000) designed as a pavé-set diamond with a geometric plaque. The plaque centers a lozenge brilliant-cut light gray-blue colored diamond weighing 0.92 carat with a calibré-cut sapphire surround. 

A fancy colored diamond, diamond and sapphire ring

A lozenge brilliant-cut fancy light gray-blue diamond, diamond and sapphire ringEstimate US$ 400,000 - 500,000 (€370,000 - 460,000). Photo: Bonhams.

designed as a pavé-set diamond geometric plaque, centering a lozenge brilliant-cut fancy light gray-blue diamond, weighing 0.92 carat, within a calibré-cut sapphire surround, mounted in platinum; size 9 3/4

Accompanied by GIA report #17160754, dated February 10, 2015, stating the diamond as: fancy light gray-blue color, SI2 clarity.

A brilliant and saturated Imperial topaz and diamond pendant brooch from the belle epoque era brings a bright splash of color to the sale ($6,000-9,000) 

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A turn of the century imperial topaz and diamond pendant brooch, circa 1900Estimate US$ 6,000 - 9,000 (€5,500- 8,500). Photo: Bonhams.

centering an oval cushion-cut imperial topaz, measuring approximately 24.2 x 14.8 x 9.04mm, within a pierced and foliate old European cut diamond foliate surround, suspending an imperial topaz briolette, measuring approximately 19.9 x 15.5 x 8.95mm, from a similarly designed surmount; estimated total diamond weight: 2.60 carats; mounted in platinum and rose gold; length: 2 3/8in. (pendant drop is detachable)

Accompanied by AGL report #CS 67683 A and B, dated May 6, 2015, stating the topaz as: Imperial, clarity enhancement: none.

A pair of ruby and diamond ear clips by Cartier (est. $10,000-15,000) and an 18K yellow gold and ruby bracelet by Tiffany (est. $5,000-7,000) can be worn during the day. 

A pair of ruby and diamond earclips, Cartier

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A pair of ruby and diamond earclips, CartierEstimate US$ 10,000 - 15,000 (€9,200 - 14,000). Photo: Bonhams.

each designed as a ruby cabochon wreath, enhanced by baguette, triangular and circular-cut diamonds; signed Cartier; estimated total diamond weight: 1.50 carats; mounted in 18k gold; length: 1in.

A 18K gold and ruby bracelet, Tiffany & Co

A 18K gold and ruby bracelet, Tiffany & CoEstimate US$ 5,000 - 7,000 (€4,600 - 6,400). Photo: Bonhams.

designed as an articulated beaded and fluted gold band, enhanced by circular-cut rubies; signed Tiffany & Co.; gross weight approximately: 103.5 grams; length: 6 1/2in.

Other highlights include a number of rare and unusual items:  

A collection of cufflinks, which include an exceptional pair of yellow gold cufflinks by Cartier, one featuring a tiny watch, and the other a compass is estimated at $10,000-15,000. Also of considerable note is a pair of art deco rock crystal and diamond cufflinks by Cartier (est. $8,000-12,000), each double link designed as a carved rock crystal bombe plaque within a pavé-set diamond surround. 

A pair of 18K gold watch and compass cufflinks, Cartier, French, 1935

A pair of 18K gold watch and compass cufflinks, Cartier, French, 1935Estimate US$ 10,000 - 15,000 (€9,200 - 14,000). Photo: Bonhams.

one cufflink with a watch, of mechanical movement, the circular dial with Arabic numerals and blued-steel hands, the second with a compass; signed Cartier, Paris, with French assay mark, watch no, 107739, 012270 (indistinct); diameter: 1/2in.

A pair of belle époque rock crystal and diamond cufflinks, Cartier French, circa 1915

A pair of belle époque rock crystal and diamond cufflinks, Cartier French, circa 1915Estimate US$ 8,000 - 12,000 (€7,300 - 11,000). Photo: Bonhams.

each double link designed as a carved rock crystal bombe plaque, within a pavé-set diamond surround; signed Cartier, New York, Paris, Londres; with indistinct maker's mark and French assay mark; mounted in platinum; diameter: 1/2in.

A signed Gianmaria Buccellati choker, which is estimated at $10,000-15,000. The hinged collar is brushed in 18K gold and enhanced by white gold foliate.  

A bi-colored 18K gold choker, Gianmaria Buccellati

A bi-colored 18K gold choker, Gianmaria BuccellatiEstimate US$ 10,000 - 15,000 (€9,200 - 14,000. Photo: Bonhams.

the hinged brushed gold collar enhanced by white gold foliate detail; signed Gianmaria Buccellati, no. 20244, with signed pouch; gross weight approximately: 79.7 grams; length: 13in.; diameter 4 1/2in

An 18K gold kinetic brooch signed by Belgian artist, Pol Bury (est. $5,000-7,000) that bears a geometric design enhanced by articulated gold boules. 

An 18K gold kinetic brooch, Pol Bury, French

An 18K gold kinetic brooch, Pol Bury, FrenchEstimate US$ 10,000 - 15,000 (€9,200 - 14,000. Photo: Bonhams.

of geometric design, enhanced by articulated gold boules; signed Pol Bury, no. 1/30, with indistinct maker's mark and French assay mark; length: 1 5/8in.

The auction will be held at 11am.