The faceted amethyst in this signet ring catches the light with every turn of the hand - the stone's purple deepens one moment and reveals a brighter glint the next, while the facets arrange it into a clear, geometric form. The minimalist setting doesn't draw attention away from the stone, and the signet's simple silhouette sits well on the finger, setting off the gesture of the hand. In jewellery tradition, amethyst has long been linked with calm and clarity of mind, and its deep colour is also associated with balance.

We select the stone for this signet ring for even, saturated colour and clarity, so every piece keeps the same high standard at a reasonable price. Good stones are becoming harder to find, and silver is rising in price, so today's price on this ring is an opportunity that's hard to overstate. Rhodium plating protects the silver from tarnishing and losing its shine, so the lustre lasts longer, and the silver itself is pure, refined European sterling silver 925, free of nickel and other harmful additives - such an alloy doesn't irritate the skin. The French maker's mark stamped on the piece attests to the origin of the metal.

A small, minimalist signet ring fits well into spring outfits - a pastel trench coat, a silk scarf and a light-coloured handbag create a muted backdrop against which the amethyst's deep purple catches the eye. It also works well with a simple dress in a cool shade of grey, where the geometry of the facets takes centre stage. It's a ring that looks good in everyday gestures - opening a door, reaching for a cup or adjusting a scarf.