Vintage in spirit and form, this silver solitaire ring sets a single moonstone in a cabochon cut at the centre of the hand. Beneath the surface drifts a cool, blue sheen - adularescence, that plays with every movement of the hand, revealing itself now brighter, now deeper, depending on the angle of light. The slender band doesn't draw attention away from the stone, so the whole composition keeps a quiet, retro silhouette.

This particular stone was chosen for its colour and clarity - these are what earned it a place in this solitaire, conceived both as a stacking ring and as an engagement ring. Good moonstones are becoming harder to find, since their availability is limited by nature itself, which makes a purchase like this a sound one price-wise today. The setting is made of refined silver of European quality, rhodium-plated, which gives a bright shine that lasts and protects the surface from tarnishing and scratches. The 925 fineness confirms the purity of the alloy, and the French maker's mark on the piece attests to the origin of the silver.

Moonstone has long been linked with intuition, inner awareness and moments of meditation, which sits well with its role in an engagement ring. In a total-black look - a black blouse or a simple turtleneck - it's the stone's blue sheen that draws the eye to the hand while the rest of the outfit stays understated. Its small, light form and weight of 2.2 grams mean the ring wears easily, and its cool glow pairs well with the cool greys and blacks of autumn-winter outfits.