This black onyx ring brings out the stone's deep, matte black and sets it against the delicate sparkle of a single cubic zirconia placed just beside it. The faceted cut of the onyx catches light across its narrow planes - as the hand moves, brief, cool flashes ripple across the dark surface, fading the moment the hand comes to rest. The simple, modern band doesn't distract from this contrast, and its smooth line suits a shape that nods to a promise ring - there's something of an unfolding gesture built into it.

We assess every onyx before it's set, checking the depth of its black and the evenness of its surface - only flawless stones move forward into production, which isn't a given at this ring's sensible price. Fine silver gets more expensive year on year, so a well-chosen stone at an accessible price holds real value today. Rhodium plating protects the 925 silver from tarnishing and keeps the setting's shine lasting for a long time. The metal comes from European refining, and the pure alloy, free of nickel and other harmful additives, is gentle on the skin. The French maker's mark on the piece attests to the quality and origin of the precious metal. Onyx has long been linked with strength, endurance and self-assurance, making it a fitting choice for a promise ring - one that carries meaning, not just decoration.

Day to day, the ring sits well among weekend layers - with an oversized sweater, a draped scarf and a quiet palette of beige, grey or charcoal, a hand wearing black onyx gains a clear but understated accent. It also works well with a simple turtleneck and loose trousers, where what matters is the gesture of the hand, not a stack of accessories. The medium stone size and light 2.5-gram weight mean the ring wears easily, without weighing on the finger.