I'm a sucker for this kind of ring!
 
The face an oval plaque, painted with a blue enamel ground and laid over this a tiny carved plinth, decorated with gold dots top and bottom, the stand bearing the sentiment 'Amitie' in black letters.
 
Ontop of the plinth a tiny urn made from three tiny natural pearls and minute gold wirework stands in honour of James Buchanan, all displayed under it's own mini glass firmament.
 
The shank is a simple cigar band type, typical of the period. 
 
The reverse of the ring is inscribed - 'James Buchanan obt 14th May 1793.
Aet 64'
 
weighs - 5.2g
face measures - 25mm x 16mm
size - 6.5 and can be resized with care
High carat gold
English circa - 1793
Excellent condition