Yellow gold solitaire ring with blue enamel diamond

Old cut diamond blue enamel ring

Solitaire ring in 18k (750°/°°) gold set with an old mine cut diamond weighing approximately 0.9 carats of estimated quality HI SI2 (no inclusions visible to the naked eye), the ring is enhanced with midnight blue enamel. French or English work from the second half of the 19th century. Note a slight enamel jump visible in photos.

Finger size 54
Weight: 2.39 grams