This ring seems to be Victorian however it is just hard to read due to the wear of the hallmarks.
18ct Gold Diamond Ring.
Hallmarks: 18 Plus British Stamps
Diamond Diameters Approx:
2 Diamonds: 2.15mm
2 Diamonds: 1.5mm
Total Diamond Weight Approx: 0.14cts
Ring Face Width: 7.0mm
Ring Weight: 3.68 grams
Ring Size: O
Resizing Service Offered at Small Cost
Note: Antique or vintage rings may have wear associated with the items age.