Ruby - Increases attack. Seems like with all stat increase CSC, it mostly increases the rate at which the stat grows- adding levels in the relevant stat 'does more'.
Sapphire - Increases accuracy.
Emerald - Increases dodge.
Topaz - Increases guard.
Garnet - Increases both attack and accuracy. The double stat increase CSC don't seem to be particularly better than the single ones, though. Apparently they may decrease the two stats they don't improve, and may not have as much of a benefit as the single ones.
Bloodstone - Increases both accuracy and dodge.
Lapis Lazuli - Increases both attack and guard.
Aquamarine - Increases under water performance.
Peridot - Increases night vision.
Malachite - Increases mobility.
Amethyst - Increases SP growth.
Onyx - Increases LP growth.
Zircon - Increases weight. (Reduces movement and knockback. Better in low gravity environment.)
Opal - Increases performance in multiple environments (under water, in darkness and in low gravity).
Moonstone - increases all stats, apparently more as you do more OBs.
Diamond - raises your level cap by 30 or 60 levels. Also decreases stat growth on everything.
Jade - Increases stun resistance, apparently also increases one stat.
Amber - Increases knockdown resistance, apparently also increases one stat.
Black opal - Increases both LP and SP growth.
Cat's eye - Increases mobility and apparently also one stat.Edit: By request, the old CSC effect table. It probably isn't relevant by now.
