I presume you could dye it any colour. It's man made.
Right sorry, rant of an angry geologist over. The blue one is actually very nice =)
Thanks for pointing this out qwerty_uiop, I was mystified why QVC think this is special, I purchased lots of this jewellery on the bay over a year a go set in silver for a fraction of their prices knowing that it was only man made and wouldn't dream of paying their prices.