Ring in platinum adorned with a round brilliant-cut diamond, 7,00 carats, solitary mount (chip)

French production from the 1920s-25 (mount)
Ring size: 55
Gross weight: 6,2 g
With a preliminary study from LFG laboratory n° 411124 dated 03/07/2024 indicating
Color: N-R
Purity: SI1
No indication of treatment