Maker - Alchemy Skill FAQ and Walkthrough

Can I ask one thing? Can those stats stack in each forge?

Say for example, I have a +10 Dex level 50 overall, and I used 1 +5 Dex crystal, 1 +5 Str crystal and 1 +3 Jump gem, which make into a +15 Dex, + 5 Str and +3 Jump level 60 overall, right?

Then can I use another +5 Dex crystal, +5 Str crystal and +3 Jump gem to make a +20 Dex, +10 Str and +6 Jump level 70 overall?