A very fine "Art Deco" Sapphire & Diamond "Quatrefoil" Cluster Ring set in Platinum (tested), English, Circa 1930.

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Object Description

A very fine Sapphire & Diamond Cluster Ring in an Open Strap Work ‘Quatrefoil design’ set in Platinum (tested), centrally set with one’ Old Cut’ Diamond of 0.55 Carats, G Colour, SI2 Clarity, surrounded by Four (4) ‘Round Cut’ Natural Sapphires with a total weight of 1.20 Carats, Royal Blue in Colour, with an indication of slight thermal enhancement, there are four (4) ‘Single Cut’ Diamonds estimated as 0.02 Carats and H – I Colour set between each Sapphire.

Total Diamond weight: 0.57 Carats.

Accompanied by an Independent Laboratory Report confirming the above assessment.

It should be noted that an indication of slight thermal enhancement in Sapphires is commensurate with Sapphire jewellery manufactured post 1915.


Circa 1930

Object History

It should be noted that indications of slight thermal enhancement are frequently found in Sapphire Jewellery made post 1915, whereas moderate to major treatments then developed as the 20th Century progressed. No treatment readings in Sapphires and particularly Rubies (of which we have several excellent examples) are scarce and as such rare.

As illustrated in the Science Museum, it has been possible to slightly heat treat Sapphires and Rubies since the Roman times and it is therefore feasible to find early Jewellery with stones, which when tested, produce an indication of slight thermal enhancement.

Object Condition

Overall very good, wear commensurate with age.

Object Details

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Dealer Contact

+44 (0)20 7491 4948

Dealer Location

143 Grays Antiques Centre
58 Davies Street