A pair of Stuart crystal mourning bracelet clasps

A pair of Stuart crystal mourning bracelet clasps, circa 1700 and later, each of oval outline, containing the initials OM beneath a Ducal coronet and the initials AC respectively, over woven hair work, enclosed within a gold rope twist border, to an outer ring of gold stars on a blue ground, each covered by a faceted crystal and mounted in gold, converted from slides and set within a matching pair of early 19th century gold bracelet clasps with beaded borders, each measuring 1.7cm x 1.5cm