An antique natural pearl and diamond pendant-clasp. Photo courtesy Philips

The oval-shaped double cluster set with old brilliant-cut diamonds to a centrally set coloured cushion-cut diamond and rose-cut diamond accents, terminating in a natural pearl drop with collet-set diamond cap, length 4 cm, concealed pendant loop and integrated double clasp fitting to rear. Estimate £12,000 - 15,000. Unsold.

Accompanied by report number A011P023VR/R, dated 29 March 2011, from the Austrian Gemmological Society, stating the pearl measuring 9.08 x 7.88 cm is natural. 

A pair of natural pearl and diamond cluster earrings. Photo courtesy Philips

Each composed of a central natural pearl within a millegrain-set old brilliant-cut diamond cluster, length 2.1 cm. Estimate £14,000 - 16,000. Unsold

Accompanied by report number A011P016VR/R, dated 22 February 2011, from the Austrian Gemmological Society stating that each pearl, measuring 11.54x10.58x7.2mm and 12.16x10.24x7.5, is natural saltwater.

A natural pearl, diamond and ruby collar necklace. Photo courtesy Philips

Composed of seven rows of natural pearls, each measuring approximately 3.4–3.9 mm, to a circular stylised floral fully detachable clasp set with oval mixed-cut rubies and old-cut diamonds, length 35 cm. Estimate £6,000 - 8,000. Unsold

Accompanied by report number 02P011VR/R, dated 25 January 2011, from the Austrian Gemmological Society, stating the pearls to be natural.

A pair of diamond and natural pearl earrings. Photo courtesy Philips

Of pendeloque form, the bow surmount set with old brilliant-cut diamonds, to a similarly cut diamond garland and articulated pearl drop, estimated diamond weight 6.30 carats, length 5 cm. Estimate £11,000 - 13,000. SOLD FOR £12,500

Accompanied by report number 04064, dated 27 April 2011, from The Gem & Pearl Laboratory, London, stating the pearls measuring 13 × 10 × 10 mm and 13 × 11.2 × 8 mm, to be natural saltwater.

A natural pearl and diamond pin. Photo courtesy Philips

The circular pierced plaque of geometric design, set with natural pearls measuring 1.1– 4.9 mm, and old brilliant-cut diamonds, with marquise-cut diamond highlights, all within a pearl surround, diamonds approximately 3.00 carats total, diameter 3.8 cm. Estimate £4,000 - 6,000. Unsold

Accompanied by report number 03611, dated 11 January 2011, from The Gem & Pearl Laboratory, London, stating that the centre pearl and samples from the drilled pearls were found to be natural saltwater.

A pair of art deco natural pearl and diamond ear pendants. Photo courtesy Philips

Each designed as a natural pearl drop suspended from an articulated geometric line set with baguette- and brilliant-cut diamonds to a similarly cut diamond single stone surmount, length 5.5 cm, post fittings. Estimate £28,000 - 38,000. SOLD FOR £34,850

Accompanied by report number 966946, dated 12 October 2000, from The Precious Stone Laboratory, London, stating that the pearls measuring 9.0 – 9.12 × 13.40 mm and 9.49 × 8.30 × 13.57 mm were found to be natural pearls.

A natural pearl and diamond necklace. Photo courtesy Philips

The central swag motif variously set throughout with old brilliant-cut diamonds, terminating in a graduating fringe composed of seven drop shaped natural pearls, to a detachable diamond-set neckchain set with two natural button pearls, early 20thcentury/ composite, length 48 cm, pendant drop 7 cm. Estimate £200,000 - 300,000. Unsold

An antique natural pearl and diamond brooch. Photo courtesy Philips

In the garland style, the central natural pearl surmounting a palmette motif set with single- and Swiss-cut diamonds amidst similarly set scrolling foliate border, terminating in natural pearl drop and diamond-set cap, set in silver and gold, detachable brooch fitting, length 6.5 cm. Estimate £11,000 - 15,000. SOLD FOR £12,500

Accompanied by report number 1122931414, dated 30 December 2010, from the Gemological Institute of America (GIA), stating that both pearls were found to be natural saltwater pearls.

A pair of natural pearl and diamond ear pendants. Photo courtesy Philips

Each designed as an old brilliant-cut diamond and natural pearl line suspending a similarly cut diamond and natural pearl fan and three row tassel, length 7 cm. Estimate £12,000 - 14,000. Unsold

Accompanied by report number 03981, dated 5 April 2011, from The Gem and Pearl Laboratory, London, stating that the pearls measure between 7.7–7.8 mm and 2.0 mm and were found to be natural saltwater with no evidence of treatment observed.

A natural pearl, aquamarine and diamond necklace. Photo courtesy Philips

The seven rows of gently graduating natural pearls, measuring between 9.6 – 2.6 mm, strung to an oval clasp set to the centre with a mixed-cut aquamarine and circular-cut diamond cluster, encircled within a white enamel frame, shortest length 55 cm, longest length 72.5 cm. Estimate £150,000 - 200,000. Unsold

Accompanied by report number 04050, dated 23 April 2011, from The Gem & Pearl Laboratory, London, stating the pearls to be natural saltwater. 

A pair of diamond and natural pearl ear pendants. Photo courtesy Philips

Each designed as a line of pear-shaped and brilliant-cut diamonds terminating in a natural pearl and diamond drop, length 6.5 cm. Estimate £30,000 - 40,000. Unsold.

Accompanied by the following reports:
– report number 03916, dated 22 March 2011, from The Gem & Pearl Laboratory, London, stating that the drop shaped pearls, measuring 14.2 × 9.0 mm, and 13.4 × 8.6 mm, are natural saltwater.
– report number 611K9G1522979, dated 5 November 2010, from the British Gemmological Association (BGI), London, stating the pear-shaped diamond weighing 1.07 carats to be D colour and SI1 clarity.
– report number 611K9G1522978, dated 5 November 2010, from the British Gemmological Association (BGI), London, stating the pear-shaped diamond weighing 1.18 carats to be F colour and SI3 clarity.
– report number 611K9G1522976, dated 5 November 2010, from the British Gemmological Association (BGI), stating the pear-shaped diamond weighing 1.14 carats to be F colour and SI2 clarity.
– report number 611K9G1522975, dated 5 November 2010, from the British Gemmological Association (BGI), London, stating the pear-shaped diamond weighing 1.10 carats to be G colour and SI2 clarity.
– report number 611K9G1522974, dated 5 November 2010, from the British Gemmological
Association (BGI), London, stating the pear-shaped diamond weighing 0.90 carats to be F colour and SI2 clarity.
– report number 611K9G1522973, dated 5 November 2010, from the British Gemmological Association (BGI), London, stating the pear-shaped diamond weighing 1.17 carats to be F colour and SI2 clarity.

A natural pearl, diamond and sapphire art deco ring. Photo courtesy Philips

The central natural button pearl, measuring 11.51-11.71 × 9.08 mm, set within a calibrecut sapphire double cluster to a circular-cut diamond bezel and shoulders, ring size O. Estimate £8,000 - 10,000. SOLD FOR £9,375

Accompanied by report number 03773, dated 22 February 2011, from The Gem & Pearl Laboratory, London, stating the pearl to be natural saltwater.

A natural pearl and diamond pendant. Photo courtesy Philips

The detachable drop-shaped natural pearl, measuring approximately 17.5 × 12.05– 12.3 mm, suspended within a pavé-set diamond openwork frame to a baguette- and brilliant-cut diamond surmount, length 6.2 cm. Estimate £60,000 - 70,000. Unsold

Accompanied by report number 0606140, dated 29 June 2006, from the Gubelin Gemlab, Lucerne, stating the drop-shaped pearl to be natural saltwater, light cream with purple and green overtones.

A pair of natural pearl and diamond earrings. Photo courtesy Philips

Each drop-shaped natural pearl, measuring approximately 12.60 × 10.60 × 14.70 mm and 12.35 × 10.80 × 13.75 mm, suspended within a pavé-set diamond openwork frame to a baguette- and brilliant-cut diamond surmount, pearl drops detachable, length 5 cm. Estimate £52,000 - 62,000. Unsold.

Accompanied by the following reports:
– report number 39416, dated 27 May 2002, from the SSEF Gemmological Institute, Basel, stating the two natural pearls to be natural saltwater.
– report number 08/2821, dated 3 December 2008, from the Gem and Pearl Testing Laboratory of Bahrain, stating both pearls to be natural pearls.

A pair of natural coloured pearl and diamond earrings. Photo courtesy Philips

Each pendant drop set with three part-drilled pearls, graduating from 5.5 –10.5 mm, and variously coloured iridescent purplish grey, iridescent black, yellow, cream and white, between which are mounted old-European brilliant-cut diamonds, length 4 cm, wire earclips. Estimate £10,000 - 12,000. SOLD FOR £11,250

Accompanied by report No. 03733 dated 12 February 2011 from The Gem & Pearl Laboratory, London, stating that the pearls were found to be natural saltwater pearls, no evidence of treatment was observed.

An antique pair of natural coloured pearl, diamond and ruby ear pendants. Photo courtesy Philips

The diamond and ruby floral surmount suspending a stylised bunch of variously coloured iridescent grey and black pearl grapes, 5.3-6.5 mm, to a realistically modelled diamond-set cap, length 5 cm. Estimate £20,000 - 30,000. Unsold

Accompanied by report No. 03675 dated 22 January 2011 from The Gem & Pearl Laboratory, London, stating that the pearls were found to be natural saltwater, no evidence of treatment was observed.

Philips. JEWELS 7 JUNE 2011 LONDON - http://www.phillips.com/