A turquoise ring catches the eye the moment it appears on the hand. The cabochon comes from the Sleeping Beauty mine in Arizona and displays a uniform, deeply saturated shade of blue - as the hand turns, the colour neither shifts nor fades but alternately deepens and brightens depending on the angle of the light. The vintage setting gives the whole piece a retro character, and the form of the ring - defined but not overdone - lets the stone draw the eye without any unnecessary competition from the silver.

Turquoise from this mine is among the most prized in the world, and a stone with such an even, clean colour is rarely found twice at the same price. Good stones from Arizona are becoming increasingly scarce, so buying now is a sensible decision on price. The stone is set in refined sterling silver 925 - a pure alloy free from harmful metal additives that will not irritate the skin. The piece is stamped with the French maker's mark, which guarantees the origin of the metal.

For a city meeting, pair the ring with a fitted ivory turtleneck and a classic trench coat - the cool blue of the turquoise lifts a neutral palette without breaking it. With a muted outfit in greys or beiges, the stone takes on the role of the only colour on the hand, and it fills that role completely. The vintage character of the setting means the ring works equally well with casual looks and with more formal, urban outfits.