A gold and silver, opal and diamond pendant

A gold and silver, opal and diamond pendant,
a pear cabochon opal, 21.0 x 13.3mm in size, with rose cut diamond set claws, to scalloped gallery. To the bottom a foliate scroll grain set with old European cut diamonds, with diamond drop. Surmounted with an old European cut diamond in clawed collet, and fluted bale. 41 x 19mm, 4.84g
Estimated at £800 - £1,200

Condition report:
Opal collet tested as approximately 14-15ct gold, bale tested as approximately 18ct gold.
Scrolling collets to bottom tested as approximately sterling silver.
Some tarnish to the silver.
Solder joins visible between gallery and diamond set claws.
Very minor nibbles to surface/facet junctions of some diamonds, visible with 10x magnification, not visible with the naked eye.
Slight crack to the gallery of the opal near the top.