A two row graduated pearl necklace

A two row graduated pearl necklace, the gold clasp set with three button shaped pearls. 42cm. Accompanied with certificate number 06199 from The Gem and Pearl Laboratory dated 4th September 2012 stating that the 158 and 165 pearls graduate from 2.4 - 2.5mm to 6.2 - 6.3mm, weigh 15.63g (total) and are natural saltwater pearls.