Three late 19th / early 20th century gold and gem-set hinged bangles

Three late 19th / early 20th century gold and gem-set hinged bangles
The first set with a circular-cut sapphire within a diamond-set double trefoil surround between graduated half-pearl shoulders; the second set with a curved line of alternating rubies and synthetic white sapphires, between synthetic white sapphire set shoulders; the third of openwork loop design set with half-pearls and brilliant-cut diamonds to diamond three-stone collet shoulders, all circa 1900, inner diameters 5.6-5.9cm