I'm really glad I opened this thread, and read about chalcedony in your post! I was thinking about buying some... glad I haven't done it yet. Thank you.
To stay on topic---yeah, that is definitely dyed howlite. I have learned the hard way to rub the beads between my fingers and check them for blue dye before I purchase the beads. I don't buy it online anymore. I have had dyed howlite bleed off, or fade to it's original white in strong sunlight. Most of the turquoise colored howlite i've bought over the years has been just fine, but I've learned to be careful, from a few bad/messy experiences with it (read: bright blue neck!).