Blue Sapphire or Blue Tourmaline Ring in Sterling

Sterling silver ring with three decently sized probably blue tourmaline or indicolite. Sorry I had it mislabled! Doing my best to sell my mother's stuff that wasn't labeled. Deep gorgeous blue with faceting set in genuine sterling silver. New with tags. Size 6 There is a small chance that this is Sapphire, but I am 90% sure that it's actually indicolite aka blue tourmaline. It's a VERY dark stone, could be mistaken as black, with a bunch of sparkle and dripping in jewel tones.