Edwardian Sapphire & Diamond Ring miniature it was originally made as

it was originally made as a watch (Albert) chain

some general wear to the gilding commensurate with age

I suspect the stone pre-dates the mount by a good 50 years

) Hoping the Instagram hive mind can help here

Striking antique signet ring set with a highly domed cabochon star sapphire

Edwardian Sapphire & Diamond Ring miniature it was originally made asDATE: Edwardian, c. 1910 This charming antique diamond ring is set with a gorgeous blue sapphire, set in a platinum millegrain square head. The head features four diamonds and two at each shoulder. The band is crafted in 18k gold and dates from the Edwardian era, circa 1910. STONES Natural Sapphire Diamonds MEASUREMENTS Head: 6. 1 x 12. 8mm Rise off finger: 3. 4mm Width of band: 1. 9mm WEIGHT 2. 3g MARKS Partial English hallmarks for 18k gold