Originally Posted by Carnivean
Yeah it is well etablished. My main concern is, how much +dmg is the meta gem equivalent to, or better said, how much is an meta slot worth in my calculations ^^.
Thanks for trying.
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Mystical Skyfire Diamond (5% chance to get next spell cast with half cast time)
- For spamming fireballs, it's around ~50 haste rating, which should be around ~40 damage in common gear. Mind you that it also increases your mana usage over time, it that's a concern.
- Frostbolts only get 1s cast time reduction (instead of 1.25s) since you're capped by the GCD, so it's only 80% efficient, ~40 haste, ~35 damage.
- Arcane Missiles get the benefit twice since the buff doesn't fade on channeled spells. That mean you can cast AM twice at double speed, until the buff fades after 4s (may be an expoit/fixed soon). So ~100 haste, ~90 damage.
- For Arcane Blast, it will mess up your rotations and do more harm than help.
Scorch and instant spells gains no benefit at all.
If you have spell haste gear, you'll run into the GCD on procs. Spell haste is wasted if the gem procs, so treat it like losing 5% of your spell haste gear.
Also, the meta gem requirements (more blue than yellow gems) are pretty stupid for PvE, prepare to regem most of your gear and forget about ever getting socket bonuses.
I have one in my T4 that I used for a while. It's really nice, but in my opinion not worth the hassle of gem requirements and not being able to go arcane/fire for arcane blast.
Relentless Earthstorm Diamond (+3% crit damage)
On the 2.2 PTR, it's fixed and not multiplies the final crit damage by 1.03. The damage equivalent depends on your damage, crit and spec. You can easily assign a crit% equivalent value for the meta gem.
Fire: 5.7% of your crit
Frost: 6% of your crit
Arcane: 7% of your crit
Arc/Fire: 5% of your crit
Arc/Frost: 5.4% if your crit
No crit talents (150% damage on crits): 9% of your crit
Ruin Warlocks, crit talented druids/shaman: 6% of your crit
That means if you're fire specced with 35% crit, then the meta gem will be worth 6% of 35% = 2% crit ~= +30 damage.
It's definately less raw damage than the half-cast time gem, but the easy gem requirements allow you to socket the rest of your gear better.