A ruby and diamond necklace

Of cluster design, set to the front with a pear-shaped ruby, within a surround of brilliant-cut diamonds suspended to a line of similarly-cut diamonds, to a tight filed trace gold chain, diamonds approx. 0.98 carat total, Partial UK hallmark on the chain, London hallmark and Maker's mark 'GA' on the necklace central part, lengths: pendant 2.5cm, chain 41.4cm