A labradorite cabochon brings a deep, dense colour into this promise ring, with a blue flash that keeps catching the light. As the hand turns, that glow slides across the stone's surface like a narrow ribbon of light, and the minimalist setting never pulls attention away from it. A simple, narrow band sits discreetly to the side, so the focus stays entirely on the stone and its shifting, cool play of colour.

A labradorite like this one - with a clear, concentrated glow and no flat, dull patches - is easy to miss among ordinary stones, and hard to match with another this good. Good labradorite is rising in price along with precious metals, so this purchase looks like sound value today. The stone is set in refined silver 925 of European quality, and the nickel-free alloy, with no other sensitising additives, keeps it comfortable even for sensitive skin. A rhodium layer protects the silver from tarnishing and losing its shine for years to come. The maker's mark struck on the silver, registered with the French assay office, attests to the metal's origin.

The ring sits well on the hand in everyday, soft outfits - with a chunky cashmere sweater or cotton knitwear in shades of grey and beige, where the stone's blue flash immediately draws the eye. Labradorite is traditionally associated with calm thinking and self-confidence, which fits well with the character of a promise ring. At a very small size and a weight of 1.8 grams, the piece stays light and never weighs down the hand, despite the stone's strong character.