An Art Deco sapphire and diamond ring, the central octagonal...

Hammer

£9,000

An Art Deco sapphire and diamond ring, the central octagonal step cut sapphire (measuring 11.79mm L x 8.4mm W x 6.1mm D), with baguette cut diamonds to stepped shoulders, all set in platinum to a plain polished shank, ring size N, weight 4.7gms

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Please note: This sapphire has not been laboratory tested for synthetic or natural origin or for heat treatment, or any other treatment, and does not come with a certificate/report. It is the opinion of the valuer that this stone is of natural origin but this cannot be guaranteed, there are no obvious indicators of heat treatment but again, this cannot be guaranteed without laboratory testing. We are unable to comment on the country of origin. The carat weight is estimated to be between 5.75 carats - 6.00 carats. Buyers are advised to view in person and make their own assessment of the stone before bidding.

The central stone is in good order. No fractures, breaks or losses to the stone are visible under 10x magnification. Some minor scratching and very minor nibbles to the facet edges. The colour is a rich, royal blue, and the colour slightly more vibrant in daylight then indoor light. Flat, reflective inclusions are visible through the table with the naked eye when turned under direct light. Other, similar inclusions are visible under 10x around the corners and sides. No windowing is visible when viewing table face up with the naked eye. The claw setting is secure.

The diamonds are in good order, no cracks, fractures or losses. Some very small inclusions visible in a couple of the stones at 10x magnification, and no draw of colour can be seen with the naked eye. All settings are secure.

Gallery and shoulders in good order, no splitting or signs of repair. Some areas of minor thinning and general wear only.

Shank is in good order. Some slight signs of thinning to the base, but no signs of splitting or repair. The inside is stamped 'PLATINUM' and numbered '0303', but there are no other marks to indicate date or makers. There are signs of possible resizing to the shank - please see the additional images for illustration. The ring came with the Boodle & Dunthorne box as pictured, however there is no evidence to associate they are original to each other. This stone has been assessed to be Art Deco, circa. 1930.

Additional images have been provided. The first shows the stone under indoor fluorescent lighting. The next three show the stone in indirect daylight. The final two show the stone in direct sunlight.

A video of the stone in natural daylight is available on request.