Originally Posted by dukes
For balance, it should only really be Runed (Red), Veiled (Red/Yellow), Rigid (Yellow) and Purified (Blue) as options I believe. Spellpower is better than haste generally, and you get more points per gem anyway (9 spell power instead of 8 haste on split gems, 19 spell power instead of 16 haste on pure).
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haste can still be considered on gems needing a yellow component (reckless only, never quick) once hit is capped. It is the best yellow gem stat for balance that doesn't cap.
The rounding errors on gems are worth considering as well. In TBC with blue gems, it was often better to use 2 reckless or veiled gems, than one runed and one great/quick, because you'd get an extra spellpower (10 vs. 9). With wrath blue gems, it's the opposite. Better to socket one runed and one rigid/quick (assuming you have a red slot and a yellow slot to fill where you care about the bonus) and get an extra spellpower over two orange gems.