A ruby and diamond ring, early 20th century, of cluster design, set with a cushion-shaped ruby,

A ruby and diamond ring, early 20th century, of cluster design, set with a cushion-shaped ruby, within a border of circular-cut diamonds with an openwork scrolled gallery, mounted in platinum, numbered 3215, French import assay mark for platinum, size O 1/2

Accompanied by SSEF report no. 137409, dated 3rd April 2024, stating that the ruby weighs 2.99 carats and shows no indications of heating. Origin: Burma