-Gems have 100% success rate at their level GR + 3. IE: Level 15 gem requires a level 18 Rift for 100% chance, 24 gem requires 27 Rift.
This one is not correct, a lvl 25gem in lvl 32 GR had like 80% chance to upgrade.
Yes the OP is wrong on the gem leveling hopefully he will fix. To get 100%chance to upgrade to next level the greater rift level has to be 10+. So if you have a level 8 gem you need to complete a level 18 greater rift for ONE upgrade to be 100% but if you want use all 3 upgrades on the same gem just add 12 so a level 8 gem would need a clear of a level 20 grift to receive all 3 upgrades at a 100% chance.
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