Vintage Mauboussin Platinum GIA Aquamarine and Diamond Rind

Magnificent vintage Mauboussin GIA certified aquamarine and diamond ring, featuring a rectangular emerald cut aquamarine adorned by three pear shape diamonds on each side. Circa 1970's.
The ring designed to set the aquamarine in a 45 degree angle on the finger to give it a unique look. The curving platinum shank is two millimeter wide.
Aquamarine: 18.75x11.74x7.47mm, approximately 12 carats
6 Pear Brilliant Cut Diamonds: 1.40 ctw. Color: F-G, Clarity: VS1
Weight: 9.27 grams
The outside of the shank was polished in the past and there is only a faint French makers mark. Size: 6.25