This engagement ring with a cabochon-cut turquoise brings out a solid, saturated sky-blue colour from the stone. Light falling on the domed surface reveals subtle glints and a depth of colour that holds up from every angle. The turquoise comes from the Sleeping Beauty mine in Arizona, source of some of the most prized stones of this kind on the market. The simple, modern setting doesn't draw attention away from the stone - the band stays slim and light, and the whole piece keeps a calm, clear silhouette.

The quality of the turquoise chosen for this ring shows in the even, uniform colour of the cabochon, free of the blotches and discolouration found in lesser stones. Silver and good stones are steadily rising in price, so buying at this price makes sense today. Refined European silver 925 is coated with a layer of rhodium, which protects the metal against tarnishing and scratches, so the shine lasts through daily wear. The French maker's mark confirms the origin of the metal this ring is made from, making it just as fitting as an engagement ring as it is a solitaire piece for anyone who values a bold, single stone. A medium size and a weight of 3.1 grams give it a form that sits comfortably on the hand.

For a day out in the city, it pairs well with a trench coat and a thin turtleneck in cool grey - the blue turquoise lifts a muted palette without needing any extra jewelry. A hand wearing this ring catches the eye with every gesture, whether reaching for a cup or adjusting a coat collar. Beige, charcoal and white remain the best backdrop for this colour, and the simple form means the ring works equally well with a tailored jacket or a casual jumper.