Ruby and diamond ring, early 20^th century. Clusters of stones are an enduringly popular design feature of rings, but this ring is a particularly attractive and unusual example, dating from circa 1920. At its core is a radiating arrangement of antique circular-cut diamonds, which seem to blend into a unified, shimmering display of light, and its border is enhanced with a floral outline of calibré-cut rubies - an ingenious touch which makes this ring a particularly rare and beautiful design from the early 20th century.