A saturated turquoise blue opens up this engagement ring with a distinctly retro character. The cabochon cut gently rounds the surface of the stone, so light spreads across it evenly, without harsh reflections - all you see is a calm, uniform colour with subtle glints along the edges. We assess every turquoise under light before it goes into its silver setting, checking the purity of the hue and the absence of discolouration. This one comes from the Sleeping Beauty mine in Arizona, source of some of the most prized turquoise in the world. An openwork, very big band with a vintage spirit brings a touch of old-world jewellery into the look, without losing the lightness of its form.

Precious metals keep rising in price, and good turquoise with such a uniform colour is becoming harder to find, which is why buying this piece today makes financial sense. At this price you get carefully selected stone and solid craftsmanship in refined European sterling silver 925 - a pure alloy, free of nickel and other allergenic additives, so you can wear the ring without worrying about skin irritation. The surface is protected by a layer of rhodium, hard and scratch-resistant, so the metal keeps its shine despite everyday wear. The metal is stamped with the French maker's mark - a guarantee of quality and of the silver's origin.

On the hand, this ring feels at home in a relaxed, urban look: with plain jeans, a white shirt and a leather jacket, the turquoise blue livens up a muted outfit and catches the eye with every gesture of the hand. It also suits a linen dress in warm grey, where the stone becomes a natural finishing touch. Its very big size means the ring sits well on the finger, and its weight of 7.7 grams gives it a noticeable, but not overwhelming, presence.