FINE JEWELLERY 2

OPPOSITE. Lot 680. A cushion-shaped colour-change sapphire and diamond ring, approximately 14.50cts, with GCS certification: Sri Lanka, no heat. Illustrated left (incandescent light), below left (daylight) Estimate £15,000-20,000

1. Lot 335. An early 20th century decorative diamond-set gold presentation box by Cartier, c.1915, decorated with the Browne-Clayton coat of arms Provenance: formerly the property of Count Redmond Toler Clayton-Browne-Clayton (1863-1937) of The Villa La Punta, Cervara Santa Margherita, Liguria, Italy, to his sister Letitia Grace Clayton-Browne (d.1937) wife of Sir William Henry Hornby (1st Baronet), thence by descent to Sir Henry Russell Hornby (2nd Baronet) and thence by descent to the current owner Estimate £10,000 – 15,000

2. Lot 617. A demantoid garnet and diamond cluster ring, the oval-shaped demantoid garnet weighs 3.13cts, SSEF certification, size L Estimate £4,000 – 6,000

3. Lot 672. A gem-set and enamel pendant by Carlo & Arthur Giuliano, with original purchase receipt Estimate £3,000 – 4,000

4. Lot 680. A cushion-shaped colour-change sapphire and diamond ring, weighing approximately 14.50cts, size J (also pictured opposite) Estimate £15,000 – 20,000

5. Lot 513. An Edwardian colour-change sapphire and diamond cluster ring, the sapphire weighs approximately 6.00cts, size K ½ Estimate £3,000 – 4,000

6. Lot 648. A colour-change sapphire and diamond ring, the octagonal sapphire weighs 6.48cts, size P Estimate £10,000 – 15,000

7. Lot 653. An Art Deco colour-change sapphire and diamond brooch, the sapphire weighs approximately 8.00cts, 7cm wide Estimate £4,000 – 6,000

Lots 513, 680, 648 & 653 all with certification.

COLOUR-CHANGE SAPPHIRES We are selling not just one, but four colour-change sapphires in the November auction. These stones possess the unique ability to exhibit one colour in daylight (blue) and change to another in incandescent light (violet/purple). The effect is caused by additional trace elements in the sapphire (such as chromium and vanadium, which interact with and absorb specific wavelengths of light) and the light-source (whose spectral output varies depending on the type of illumination).