The Onyx measures 7mm by 4mm. The face of the ring is 13mm north to south. The ring falls on a US Mandrel at a US Size 6.5, UK size M 1/2. It is fully hallmarked, has been tested, and verified weighing in at 7.5 grams. There are no problems. This item is pre-owned and there will be ordinary and normal use marks. Comes from a clean, smoke-free home. This item is in the category “Jewelry & Watches\Fine Jewelry\Rings”. The seller is “besparkledagain” and is located in this country: US. This item can be shipped worldwide.