Antique cushion cut ruby and diamond heart cluster ring

Within a heart shaped border of small cushion cut and old single cut diamonds, open cut down collet set in silver, gold to the pierced gallery underbezel and shank, tapered at the shoulders, stamped '18C'.
Cluster 1 x 1cm / 3/8 x 3/8''
The ruby approximately 0.55cts
Ruby approximately 5.45 x 4.50 x 2.60mm
Weight: 3g