A rich, deep blue turquoise brings a calm, even tone to this ring, with no streaks or discolouration. The cabochon cut shows off the stone's smooth, matte surface, while ten small cubic zirconia stones surround it with a narrow, shimmering ring of light. The curved, delicately openwork band recalls silhouettes seen in antique jewelry, giving the whole piece a distinctly vintage character that works well as an engagement and promise ring.

We assess every turquoise before it is set, checking its colour and consistency - the stone chosen for this model comes from the Sleeping Beauty mine in Arizona, prized for its pure, intense blue. Silver and good coloured stones are rising in price, and turquoise of this quality is becoming harder to find, so buying now makes sense price-wise. The ring is made of refined European 925 silver, coated with a layer of rhodium that protects the surface from tarnishing and scratches, keeping its shine bright for years. The piece bears the French maker's mark, which attests to the origin of the silver.

A ring like this looks good on the hand in everyday, city outfits - with jeans, a white shirt and a leather jacket, the turquoise blue clearly stands out against simple, muted clothing. A subtle hand gesture, like brushing back your hair or holding a cup, brings the stone even closer into view. Its medium size and weight of 3.2 grams make the ring comfortable to wear, and its vintage form pairs just as well with a simple sweater as with an evening shirt.