help with radiant ring plz ??

[nemein]

so a friend has radiant ring profession and he can make sparkling and brilliant diamond gem but how does he make the other ones like amethyst gem and so on, does he need a secret technique or something ?? any help for this would be great 

[Nitonic]

Radiant Ring can only craft diamond.

Different colored gems can be acquired from either gem pouch dropped by level 45 dungeon bosses,

or gem chests created using gem fragments through transmute feature.

Green gem chests will give you higher shape gems than the fragments used, while Brilliant/Sparkling gem chests will give you end-game gems for you to use.

Do note thou, transmute has chance to fail and both pouch/chest will give you random color/stat gems