Unheated deep blue sapphire ring of 3.87 carats (lab certificate) and old-cut diamonds (1.60 carats) by Robert Algranate, early 20th century

Type of jewelry: Antique jewelry / Antique ring
Period: Early 20th century
Metal: 18k gold (750/1000)
Origin: French work (French hallmark)
Maker’s mark with the initials R.A. and two dots, corresponding to Robert Algranate
Total weight (gross): 6.30 grams
Ring size: 52 (resizing possible)
Dimensions (ring head): 1.8 cm x 1.3 cm
Nature of the stones: Unheated sapphire (approximately 3.87 carats, Bellerophon Gemlab Paris Place Vendôme laboratory certificate indicating the absence of heat treatment) and old-cut diamonds (approximately 1.60 carats)
Condition: Very good condition
Price: €4,900
Reference: 24 035 3