The ring falls on a US Mandrel at a US Size 10, UK size T 1/2.  The face of the ring is 24mm north to south  and 24mm east to west.   It is fully hallmarked, has been tested, and verified weighing in at 15.6 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. 
 

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