I inherited this ring, the back states “18k Casbah” inside. It’s gold thick band with three large opals and a smaller opal surrounded by 23 diamonds.
Unsure
An 18k Opal & Diamond Dress Ring, 1970's
of triple floral cluster design each petal collet-set with a circular and a pair of marquise-shaped cabochon opals edged by 23 small brilliant-cut diamonds, shank stamped “18k Casbah”.