A classic signet ring with black onyx draws the eye with the depth of its matte black surface, where the cabochon conceals subtle glints of light. As the hand turns, the stone's surface plays with a cool, dark shimmer, while the wide, smooth setting gives the whole piece a distinctly masculine, decisive character. This is a signet ring in its purest form - substantial, understated, free of unnecessary ornament.

An onyx like this, with a uniform, deep black free of the smallest scratch or discolouration, is easy to overlook among hundreds of stones and hard to match once found. Silver and good stones get more expensive year after year, so buying this ring today remains a sound decision price-wise. The rhodium layer protects the silver surface from tarnishing and losing its shine, so the lustre lasts a long time. The 925 fineness confirms the purity of the refined European silver, and the maker's mark registered with the French assay office attests to the origin of the metal. In old traditions onyx was associated with strength, endurance and confidence - symbolism that suits a signet ring worn with intention well.

For an evening out, the signet ring pairs well with a little black dress or a silk blouse, worn without further adornment on the hands. Its big size and the flat, striking surface of the onyx draw attention with every gesture, when the rest of the jewelry is kept to a minimum. It's also worth reaching for it with a dark suit or a plain shirt - the black of the stone then sets off the metal in a restrained, confident way. This black onyx in a classic signet ring of rhodium-plated 925 silver stays in the memory long after the ring is taken off the finger.