An impressive Art Deco ruby and diamond ring, 1920's

An impressive Art Deco ruby and diamond ring, 1920's, set with a cushion-cut ruby weighing 5.667cts, between stepped shoulders set with baguette-cut diamonds, mounted in platinum, stamped PT 950, mark for platinum, size L 1/2

Accompanied by report number 136293 dated 20th February 2024 from SSEF stating that the antique cushion step-cut ruby weighing 5.667cts, measuring 12.37 x 8.87 x 5.35mm, is of Burmese (Myanmar) origin, with no indications of heat treatment