As per your Nevergrind Patch Notes 1-0-4, respeccing doesn't cost crystals anymore, but when I attempt to buy a respec it tells me I must purchase more crystals. The UI does not show that it is required under the gold cost anymore.
Firstly, I'm surprised you remove the cost... no complaints here.
Secondly, I currently have 0 crystals, so I can't tell if it would work if I had some.