A collection of three rings

A collection of three rings, comprising: a ring designed as a cluster of brilliant-cut diamonds and circular-cut rubies, mounted in white gold, size P, stamped 18CT, case; a ring set with an oval sapphire within a border of single-cut and baguette diamonds, mounted in white gold, size M1/2, case; and ring set with an opal triplet within a border of single- and circular-cut diamonds, mounted in gold, size O, case