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Ring – Amethyst & Diamond Cluster

30055
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A modern cluster ring principally featuring a large central amethyst in a four-claw setting with two stepped shoulders ether side of tension-set princess-cut diamonds. Entirely constructed from 18ct yellow gold. Circa 2011.

£2,750.00
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Description

Ring – Amethyst & Diamond Cluster

A modern cluster ring principally featuring a large central amethyst in a four-claw setting with two stepped shoulders ether side of tension-set princess-cut diamonds. Entirely constructed from 18ct yellow gold. Circa 2011.

 

Assessment of the Amethyst¹.

Cut: emerald-cut (or step-cut²).

Measuring: 11.90mm x 9.97mm x 6.16mm.

Calculated weight: 5.25cts.

Colour: deep to very deep purple (5P.8/2).

Clarity: VVS.

 

Assessment of the Diamonds (twelve).

Averages stated where applicable.

Cut: princess-cut³.

Measuring: 2.00mm.

Estimated total weight: 0.76cts.

Colour: G/H.

Clarity: VS1/VS2.

 

Details of the Setting.

Hallmarked: 18ct gold, Birmingham.

Sponsor’s mark: ‘AD (Anglo Diamonds).

Finger size: O.

Weight: 9.41g.

Condition: excellent.

 

£2750.00.

 

                                                                                                                                                     

Comment(s).

¹. “The violet and purple varieties of quartz provide the most prized, and in many respects the most interesting, of the large family of quartz minerals. Amethyst, the name by which this variety of quartz is known, is of ancient derivation. Pliny stated that the gem was so called from the colour being near to, but not quite reaching, that of wine. The name is also said to have been derived from the Greek word 'amethustos', which is translated as ‘not drunken’, and was given to the stone from the belief that a wearer would not to suffer unduly from excess consumption of alcoholic liquors. As an amulet, amethyst was believed to dispel sleep, to sharpen the intellect, to be an antidote against poison, and to preserve the wearer against harm in battle. In ecclesiastical circles amethyst has always been held in high esteem and many of the finest specimens of this beautiful variety of quartz are set in the fingerings of bishops. Although amethyst is always violet and Hugh, the range of colour is very wide and may vary from nearly colourless with a faint moving tent to a glorious purple” (Robert Webster, ‘Gems. Their Sources, Descriptions and Identification’, fifth edition, 1994). The colour of amethyst isn’t due to any one particular inclusion, but as a result of a ‘colour centre’ – a structure within the material composed on a number of physical condition and inclusions, which absorb part of the visible spectrum, effectively like a filter over a light. “The formation of the iron centres relevant to the violet colour of amethyst can be characterized by the following formula: Fe3+(S1) + Fe3+(I4) ↔ Fe4+(S) + Fe2+(I4) The mechanism is due to an electron transition caused by gamma irradiation: an electron is impelled or released from a substitutional Fe3+ and trapped by an interstitial Fe3+. Consequently, by losing the negative electron, the substitutional Fe3+ is oxidized to an Fe4+ centre, while the interstitial Fe3+ is reduced to Fe2+” (Ultrich Henn and Rainer Schultz-Gűttler, ‘Review of Some Current Coloured Quartz Varieties’, in The Journal of Gemmology, vol 33, 2012).

 

². The step-cut is among the oldest cuts and is still very popular today. Because of the relative simplicity it has a modern appearance. In the step-cut a series of more or less rectangular facets on the crown and pavilion proceed in rows (or steps) towards the girdle and culet. Although sometimes the pointed corners are left, it is more usual to find them slightly cut off. Therefore, in actually creating an octagonal outline, however when small, the stone retains a squarish, or rectangular appearance and is subsequently called an ‘emerald-cut’. This is because it is a commercial way of cutting emerald and other beryls or long prismatic gemstones. The step-cut is less complicated than the brilliant, but because each facet is larger in area cutting and polishing takes longer, also slight inaccuracies are easy to see. It is a test of the lapidary’s skill because the long and narrow facets must be close to perfectly parallel, otherwise they look wedge shaped. When well fashioned this facet design produced long ribbons of reflective light and a wide uninterrupted view of the gemstone’s body hue, tone and saturation of colour.

 

³. A princess-cut diamond is a mixed-cut facet design used for diamonds, typically square, of a slightly rectangular outline. Although not patented or standardised, they are several commonly encountered facet designs used for princess-cuts, all of which share the common features of a stepped scissor-cut crown, and a pointed culet. “Developed in the 1970s the princess-cut is relatively new among the fancy shapes. Its most distinction feature is that it preserves the natural square of the octahedral crystal. This natural shape would be lost if the rough were polished as a round” (Yasukazu Suwa and Andrew Coxon, ‘Diamonds, Rough to Romance’, 2009). “Like the radiant, it is a combination of a brilliant and step cut, so that it is cut as a square or truncated carré, depending on the basic shape of the rough material. If the cube surface of the octahedron is maintained, a square cut with sharp edges is formed. In general, the princess cut has a very good fire and a high degree of brilliance, which explains why it has gained wide acceptance on the diamond market” (Verena Pagel-Theisen, ‘Diamond Grading ABC The Manual’, ninth edition, 2001).

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30055
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Ring – Amethyst & Diamond Cluster

Ring – Amethyst & Diamond Cluster

A modern cluster ring principally featuring a large central amethyst in a four-claw setting with two stepped shoulders ether side of tension-set princess-cut diamonds. Entirely constructed from 18ct yellow gold. Circa 2011.

Write your review
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