Antique English 18k Gold Old Mine Cut Diamond and Natural Sapphire Ring

-Hallmarked "Sheffield's Crown 18" (18k gold), "Anchor" (Birmingham) and maker's mark "G&S"
-Size 9 and somewhat resizable
-2.4 grams
-Old Mine Cut Diamond ~0.52ct measures approximately 5mm x 4.2mm
-Two natural sapphires measures approximately 3.4mm in diameter 
-Four single cut diamond accents
-Face of ring measures approximately 15mm x 5.6mm
-Rises approximately 3.8mm from finger
-Back of band measures approximately 2.2mm wide