Lot 120. LEVIEV: A magnificent platinum diamond ring set with an emerald-cut type IIa diamond of D color, VVS1 clarity, weighing approximately 35.00 carats. Estimate US$1,700,000 - US$2,500,000. © Bonhams 2001-2023

New York – Bonhams presents a magnificent private collection of jewelry from a Southern Californian owner featuring 120 lots from leading fine jewelry houses including Mauboussin, Tiffany & Co., Cartier, Chopard, Boucheron, LEVIEV, Bvlgari, De Grisgono and Van Cleef & Arpels. The Perfect Jewelry Box: Jewels from an Impressive Southern California Collection spans the decades from Art Deco to modern contemporary. The jewelry will be sold at Bonhams New York on March 8.

Leading the sale is a magnificent LEVIEV platinum diamond ring set with an emerald-cut type IIa diamond of D color, VVS1 clarity, weighing approximately 35.00 carats, signed LEVIEV. The spectacular ring is offered with an estimate of US$1,700,000-2,500,000.

Lot 120. LEVIEV: A magnificent diamond ring. Estimate US$1,700,000 - US$2,500,000. © Bonhams 2001-2023

Centering an emerald-cut diamond, weighing 35.00 carats, accented by a round brilliant-cut diamond-set gallery and shank; signed LEVIEV; estimated total remaining diamond weight approximately 1.90 carats; mounted in platinum; size 5¼

Accompanied by GIA report stating that the diamond is D color, VVS1 clarity. Report no. 2225746340, dated 8 December 2022.

Accompanied by GIA Type Classification letter stating that the diamond is type IIa, dated January 18, 2023.

Caroline Morrissey, Bonhams Director and Head of Jewelry, New York, commented: "This jewelry collection is truly exceptional and represents the perfect jewelry box. We are excited to showcase both the magnificent 35.00 carat LEVIEV diamond ring and the 22.10 carat diamond, not to mention the rare and important Mauboussin tassel necklace. It's not often a jewelry collection contains both rarities, and many more jewels besides."

Also on offer is an impressive platinum diamond ring weighing approximately 22.10 carats set with an oval brilliant-cut diamond that is type IIa, D color, VVS2 clarity. Offered with an estimate of US$900,000-1,500,000.

Lot 110. An impressive platinum diamond ring weighing approximately 22.10 carats set with an oval brilliant-cut diamond that is type IIa, D color, VVS2 clarity. Estimate US$900,000 - US$1,500,000. © Bonhams 2001-2023

Centering an oval-shaped diamond, weighing 22.10 carats, flanked by bullet-shaped diamonds; estimated remaining total diamond weight approximately 1.05 carats; mounted in platinum; size 5

Accompanied by GIA report stating that the diamond is D color, VVS2 clarity. Report no. 2225746347, dated 8 December 2022. With a working diagram stating the diamond's clarity can potentially be Internally Flawless.

Accompanied by GIA Type Classification letter stating that the diamond is type IIa, dated January 18, 2023.

Another highlight is a diamond ring set with a square emerald-cut diamond also a type IIa, D color, VVS2 clarity, weighing approximately 11.37 carats. Offered with an estimate of US$350,000-550,000.

Lot 71. A diamond ring set with a square emerald-cut diamond also a type IIa, D color, VVS2 clarity, weighing approximately 11.37 carats. Estimate US$350,000 - US$550,000. © Bonhams 2001-2023

 Centering a square emerald-cut diamond, weighing 11.37 carats flanked by tapered baguette-cut diamonds; size 5

Accompanied by GIA report stating that the diamond is D color, VVS2 clarity. Report no. 6224746333, dated 8 December 2022. With a working diagram stating the diamond's clarity can potentially be Internally Flawless.

Accompanied by GIA Type Classification letter stating that the diamond is type IIa, dated January 18, 2023.

Other notable highlights:

A significant, Art Deco gem-set, diamond, and enamel tassel necklace by Mauboussin, France, circa 1920. The Art Deco pendant necklace is composed of alternating cylindrical black enamel links, ruby rondelle beads and platinum plaques of a budding flower design set with rubies, sapphires, emeralds, and amethysts, suspending a dramatic tassel featuring a ruby rondelle beads and a half cabochon emerald. Offered with an estimate of US$150,000-250,000.

Lot 109. Mauboussin: An Art Deco gem-set, diamond, and enamel tassel necklace, circa 1920. Estimate US$150,000 - US$250,000. © Bonhams 2001-2023

Accompanied by AGL report stating that the two emeralds of Colombian origin, with minor traditional clarity enhancement. Report no. 1128331 A and B, dated 12 December 2022.

An exceptional sapphire and diamond platinum ring the rectangular cut 24.00 carat sapphire is of Sri Lankan origin. The ring is offered with an estimate of US$200,000-300,000.

Lot 119. An exceptional Sri Lankan sapphire and diamond platinum ring the rectangular cut 24.00 carat sapphire. Estimate US$200,000 - US$300,000. © Bonhams 2001-2023

Centering a rectangular-cut sapphire, measuring approximately 24.80 carats, accented by a round brilliant-cut diamond-set gallery and shank; estimated total diamond weight approximately 1.55 carats; mounted in platinum; size 5½.

Accompanied by AGL report stating that the sapphire is of Ceylon (Sri Lanka) origin, with no evidence of heating or clarity enhancement. Report no. 1128332, dated 12 December 2022.

Lot 82. A striking emerald and diamond ring set with a rectangular-cut emerald of Colombian origin within an emerald-cut and oval-shaped diamond frame. Estimate US$60,000-90,000. © Bonhams 2001-2023

Centering a rectangular-cut emerald within an emerald-cut and oval-shaped diamond frame to a shank of similar design; estimated total diamond approximately 5.70 carats; estimated total emerald weight approximately 9.80 carats; mounted in platinum and 18k gold; size 5¼.

Accompanied by AGL report stating that the emerald is of Colombian origin, with no evidence of heating or clarity enhancement. Report no. 1128332, dated 12 December 2022.

Lot 83. A diamond and emerald bracelet of a central line of twelve graduated square-cut emeralds, interspersed with emerald-cut diamonds. Estimate US$50,000-70,000. © Bonhams 2001-2023

Comprising a central line of twelve graduated square-cut emeralds, interspersed with emerald-cut diamonds, together flanked by two rows of graduated round brilliant-cut diamonds; estimated total diamond weight approximately 28.50 carats; estimated total emerald weight approximately 10.15 carats; mounted in platinum 6½ in.

Accompanied by AGL report stating that the two emeralds of Zambian origin, with minor traditional clarity enhancement. Report no. 1128329, dated 12 December 2022.

In 2022, Bonhams introduced 'The Weekly Edit', offering over 100 items of jewelry each week at Bonhams.com, giving access to a wider selection of jewelry with estimates ranging from $500-1,500. The items are live for 11 days allowing plenty of time to shop with newness added on a weekly basis. We are excited to offer in tandem with the significant private jewelry collection, some wearable signed jewels from the same collection within The Weekly Edit: Jewelry starting March 3rd.