This ring is hand set from an 18 x 24mm semi-precious pink mother of pearl shell cabochon set into a silver plated ring.
Smallest size - UK N, US 6.5. It will open out about 1 - 2 sizes.
Mother of pearl is a natural product so each stone will have its own individual markings and inclusions.
If you have had your colours analysed, it is suitable for a summer palette.