Antique mourning knot ring with enamel and diamonds in yellow gold

Antique mourning knot ring with enamel and diamonds in yellow gold. Centred with a stylised knot mot decorated with fine enamel and five cushion shape Old Mine cut diamonds in grain settings, to a five stone crossover ring, with raised borders, overlapping knot motif and flanked by integrated shoulders with undulating engraved plaques which continue to the reverse. Engraved to the inner in script 'WORNE FRED'. Indistinguishable hallmarks. 

Signs of wear to the fine enamel due to age.