I believe the developers publicly stated that putting stats on Color Crystals was a mistake in the first place and that they should have been purely cosmetic...
I'm pretty sure I remember seeing that conversation go by here on the forums, I think around the time they made (almost(1)) all crystals 136/+41.
(1) There are still a few low-powered crystals around, notably ones you can get as mission rewards on starter worlds (e.g. the Spanios/Moracen mission on Tython, which rewards a +3 or +4 crystal).