“Emeralds form when colourless, naturally occurring beryls are infused in the Earth with the elements chromium or vanadium, lending to their famous green hue.
“Emeralds are the May birthstone, appropriately representing spring, renewal, good fortune, and clarity, and they are traditionally imported from mines in countries including Colombia, Ethiopia, Pakistan, Madagascar, Canada and Zimbabwe.
“Le Vian’s own Costa Smeralda Emeralds, in particular, meticulously chosen for their quality and colour, are ethically sourced in Zambia and Brazil.”
The Duchess matched her jewellery with an emerald-green floor-length gown, which had a tulle, ruffled neckline that showed off the Duchess’ bare shoulders and neck.
source: express.co.uk