Both of them ask for crafting each of the 4 different Radiant gems, I am very far from having a single one but they seem to be duplicates to me - are there any differences?
Is to do 1 perfect gem out of the 4. That's why they show you the same list as in the other achievement.
Is to do 1 perfect gem of every of the 4 types.
So basically, you'll get Perfect as tears first, and then do the same thing on every type of jewel. (ruby, emerald, topaz, amethyst)