Platinum Ring Set With A Burmese Ruby

Antique platinum ring, hallmarked with a dog's head.
Band-shaped, it features three rows of 8x8 cut diamonds, interspersed with nine smaller diamonds in bezel settings.
Approximate weight: 2 carats.
The ring is adorned with a natural, mixed cushion-cut ruby of a lovely red hue.
It is accompanied by its Gem Paris certificate, stating:
Dimensions: 7.2 x 6.1 x 3.7 mm;
Origin: Burma;
No alterations or heat treatment observed;
Slight presence of colorless oil;
Weight of the piece: 16.6 g;
Adjustable ring size: 50;
French work, circa 1930.