In the July sale in Hong Kong, Bonhams is pleased to offer some top quality 'no oil' Colombian emeralds, including: a 6.69 Carat Emerald and Diamond Ring (estimate: HK$1,350,000–2,500,000), and a Pair of 6.06 Carat Emerald and Diamond Pendent Earrings (estimate: HK$550,000–700,000).

Lot 591. A Fine 6.69 carats Colombian Emerald and Diamond Ring. Estimate HK$ 1,350,000 - 2,500,000 (€ 160,000 - 290,000). Unsold. © Bonhams 2001-2020.

The step-cut emerald, weighing 6.69 carats, between baguette-cut diamond shoulders, ring size 6½

Accompanied by a report from SSEF stating that the natural emerald has no indications of clarity enhancement and originates from Colombia.

Accompanied by a Gübelin report stating that the natural emerald has no indications of clarity enhancement and originates from Colombia. Also, with an extra information sheet.

Lot 617. A Pair of 6.06 Carat Colombian Emerald and Diamond Pendent Earrings. Estimate HK$ 550,000 - 700,000 (€ 63,000 - 80,000). Sold for HK$ 688,125 (€ 78,671). © Bonhams 2001-2020.

The pear-shaped emerald surmounts, suspending similarly cut emerald drops, each within a marquise-cut diamond surround, between similarly cut diamond spacers, diamonds approximately 3.35 carats total, emeralds 6.06 carats total, length 4.0cm

Accompanied by four Gübelin reports stating that the 1.98, 1.84, 1.26 and 0.98 carat natural emeralds have no indications of clarity enhancement and originate from Colombia.

Jean Ghika, Bonhams Global Head of Jewellery, commented: "Over the past five years, the increasingly strong prices achieved for emeralds at auction suggest that buyers are actively seeking out the very best examples. The most highly prized, those of Colombian origin with no evidence of oil enhancement, are extremely rare –both naturally and in the market. Given the shortage of supply and rarity of the best examples, we anticipate that this is a trend that will continue."

Other star lots from the 6th July sale include a group of impressive jewels from the Zurich-based jeweller, La Serlas. These hail from a European Collection and include:

Lot 621. A Fine Diamond and Coloured Diamond Rivière Necklace, by La Serlas. Estimate: HK$780,000–1,500,000 (€ 90,000 - 170,000). Unsold. © Bonhams 2001-2020.

The twenty-seven cushion and old brilliant-cut diamonds, graduating in size towards the front, between spacers set with brilliant-cut diamonds of pink tint, within brilliant-cut diamond frames, certified diamonds 23.13 carats total, coloured diamonds approximately 3.00 carats total, remaining diamonds approximately 4.00 carats total, maker's mark, coloured diamonds untested for natural colour, length 40.8cm.

Property of a European collection.

Accompanied by twenty-seven GIA reports stating that the 2.06 to 0.60 carat diamonds are D-F colours and VVS1-VS2 clarity.

Accompanied by La Serlas original invoice.

Lot 620. An Impressive 20.05 Carat Ceylon  Sapphire and Diamond Dress Ring, by La Serlas. Estimate: HK$630,000 - 950,000 (72,000 - 110,000). Sold for HK$ 688,125 (€ 78,671). © Bonhams 2001-2020.

The step-cut sapphire, weighing 20.05 carats, between triangular-cut diamond shoulders, the mount accented by brilliant-cut diamonds, extended to the half hoop, diamonds approximately 4.00 carats total, signed, numbered, maker's mark, ring size 7½, original case.

Property of a European collection.

Accompanied by a report from SSEF stating that the natural sapphire has no indications of heat treatment and originates from Ceylon (Sri Lanka).

Accompanied by a copy of GRS report stating that the natural sapphire is (GRS type 'cornflower') blue colour, has no indications of thermal treatment and originates from Burma (Myanmar).

Other highlights of the sale include:

Lot 619. An Important 28.44 Carat Burmese Unheated 'Pigeon's Blood' Ruby and 19.50 Carat Diamond Necklace. Estimate: HK$2,600,000–3,600,000 (€ 300,000 - 410,000 ). Unsold. © Bonhams 2001-2020.

Set with seven cushion and oval-cut rubies, weighing 17.69 carats total, graduating in size towards the front, between smaller oval-cut ruby spacers, completed by circular-cut rubies, accented by brilliant and marquise-cut diamonds, diamonds approximately 19.50 carats total, remaining rubies approximately 10.75 carats total, length 40.80cm.

Accompanied by seven GRS reports stating that the 2.81, 2.80, 2.58, 2.45, 2.43, 2.35 and 2.27 carat natural rubies are (GRS type "Pigeon's Blood") red to vivid red colour, have no indications of thermal treatment and originates from Burma (Mogok, Myanmar).

Lot 589. An Exceptional Strand of Lavender Jadeite Bead, Ruby and Diamond Necklace. Estimate: HK$ 2,500,000–3,500,000 (€ 290,000 - 400,000). Sold for HK$ 3,125,625 (€ 357,344). © Bonhams 2001-2020.

Comprising sixty-eight translucent jadeite beads of lavender colour, between ruby rondelle spacers, completed by two clasps set with cabochon rubies, pear-shaped pink sapphires, circular cultured pearls, accented by brilliant-cut diamonds, jadeite beads 14.8-14.1mm, rubies approximately 4.00 carat total, pink sapphires approximately 14.70 total, necklace convertible to become two strands, length 117.0cm or 62.5cm and 54.5cm

Accompanied by two Hong Kong Jade & Stone Laboratory reports stating that the selected natural fei cui (jadeite jade) have no resin detected.

Lot 614. An Important 6.65 carats unheated Kashmir Sapphire and Diamond Ring. Estimate HK$ 2,860,000 - 3,200,000 (€ 330,000 - 370,000). Sold for HK$ 3,750,625 (€ 428,799). © Bonhams 2001-2020

The oval-cut sapphire, weighing 6.65 carats, between triangular-cut diamond shoulders, diamonds approximately 1.20 carats total, ring size 5½

Accompanied by a report from SSEF stating that the natural sapphire has no indications of heat treatment and originates from Kashmir.

Accompanied by an AGL report copy stating that the natural sapphire originates from Kashmir.

Accompanied by a Gübelin report stating that the natural sapphire has no indications of heat treatment and originates from Kashmir.

Accompanied by a GIA report stating that the natural sapphire has no indications of heat treatment.

Unheated Kashmir Sapphires
Sapphires hailing from Kashmir display a vivid velvety blue hue that is unique to the region. They are among the most highly-prized gems due to their rarity and their scarcity; while there are still superfine sapphires to be found in Burma and Ceylon, no mining activity has taken place in Kashmir for many decades and the mine that yielded the finest specimens was largely exhausted by 1887, after only six years of production. Lot 614, a 6.65 carat unheated Kashmir sapphire is a superlative example from this legendary period of production.

Lot 612. A Pair of 14.65 Carat Emerald and 8.05 Carat Diamond 'Cluster' Pendent Earrings, by Graff. Estimate: HK$160,000–300,000 (€ 18,000 - 34,000). Sold for HK$ 288,125 (€ 32,940). © Bonhams 2001-2020.

Of chandelier design, each earring set with three pear-shaped emeralds, suspended from circular-cut emerald florets, between brilliant-cut diamonds, diamonds approximately 8.05 carats total, emeralds approximately 14.65 carats total, signed, numbered, length 5.9cm, original case.

Accompanied by an original quality certificate from Graff.

Preview and bidding will be done in accordance with the latest government guidelines. This includes the option of an appointment-only preview and a 'behind-closed-doors' auction, where an auctioneer will be present on the rostrum, and bids will be accepted in the following formats: online, on the phone, or by leaving an absentee bid.