The Capriccio Ring, a stellar piece from London’s Hatton Garden: 3.99 carats of tanzanite set in 18ct white gold: Members save over £6,000

Tanzanite is an extraordinary gemstone. Its glorious blue, flashing with fleeting hints of purple and gold, is a wonderful colour—and thanks to the stone’s unusual aura, its near reverence by New York jeweller Tiffany, and the likelihood that it will be mined out in the not too distant future, it is one of the world’s most coveted gemstones.

Tanzanites which tend towards blue are the most valuable, and this is a high-quality example. The tanzanite is large at 3.99 carats, beautifully oval cut, and so lively that it magnetizes all who see it. It is beautifully cluster set with diamonds, more diamonds cascading down the band.

The result is the Capriccio Ring, a jewel of real beauty which any woman would adore. It is captured in a contemporary diamond cluster setting featuring .63 carats of high-quality diamonds (colour F-G, clarity VS) set in 18ct white gold. There is one only.

RRP £10,050. CCUK £3,590.