This black onyx signet ring draws the eye with its bold, geometric form. The faceted stone catches the light across its narrow planes, flashing with every movement of the hand, and the deep black of the onyx carries no discolouration whatsoever. Onyx has long been associated with strength, resilience and self-assurance, which suits the clean, classic silhouette of this ring well. Its very small size means the form has been pared right down to its essence, with no extraneous detail to draw attention away from the stone.

For this piece we chose an onyx with the deepest, most uniform black, free of streaks or translucent patches, something that is immediately visible given the size of the stone. Silver prices rise year on year, and well-selected stones with a pure, even colour are becoming harder to find, which is why buying a ring like this today makes good financial sense. The signet ring is made from refined sterling silver 925, and a rhodium layer protects the surface from tarnishing and dulling for years to come. The alloy contains no nickel or other harmful additives, so the metal will not irritate the skin even with everyday wear. The silver is stamped with the French maker's mark, confirming its origin.

This signet ring works best styled in total black - a black turtleneck or a simple black top creates a backdrop against which the onyx becomes a point of light on the hand. It also pairs well with a dark leather jacket or a wool coat in cool grey, where the facets of the stone catch every glimmer. This is a ring for someone who likes a striking yet understated form - free of excess detail, with one strong black stone at the centre of the hand.