A characterful old mine cut diamond, remounted in a handmade cut down setting of silver fronted gold in Georgian style, with a simple 5mm jump ring. 
 
Silver and 18ct yellow gold 
Weight approx 0.63g
Diamond tested as natural, earth mined diamond 
Diamond 0.67ct, approx J/K Colour, VS clarity 
Total drop approx 13.5mm
Width approx 6.5mm