I picked these up recently because the colour has me quite stumped. They're a silvery grey though in some lights they have almost a blueish purple tinge to them and the pearls themselves range between 9.5mm and 11mm. My question is are they dyed? Or is this colour natural? Since the drill holes were not helpful in answering they dye question either way it in this case I thought I'd ask people who have more experience than me.