An opal and sapphire cluster pendant and chain

claw set oval opal, approximately 19.8 x 16.5mm, estimated approximate weight 10.90ct, surrounded by twenty round faceted sapphires, and suspended from a tapered sapphire set panel with a plain bale, length including bale 5.5cm, width 2.4cm, unmarked, tested as 9ct gold, belcher link chain, length 40cm, hallmarked London, 9ct gold, gross weight 11.5g, cased