Two pendants and a chain, a circular pendant decorated with blue, green and red enamel, recalling

Two pendants and a chain, a circular pendant decorated with blue, green and red enamel, recalling the stained glass windows of Notre Dame Cathedral in Paris, length including bale 3.2cm, width 2.4cm, unmarked, tested as 18ct gold, together with a plain polished cross pendant, length 1.5cm, width 1cm, hallmarked London, 18ct gold, suspended from a snake chain, length 39cm, unhallmarked, stamped '750', gross weight 7.6g