WHITING AND DAVIS saphiret rivoli adjustable cocktail ring.  This ring is adjustable and from 6 3/4 to 7 3/4 in size and is hallmarked on the interior of the ring band.  The large saphiret rivoli stone is 18mm in diameter and unfoiled so you will never have to worry about foil loss and will always have that beautiful coloring. Thanks for looking!