In French How is joyeux different from joyeaux?

"joyeux" (pronounced "zhwa-yuh") means happy or joyful, as in the expressions joyeux anniversaire (happy birthday) and joyeux Noël (merry Christmas).

"joyeaux" is not a Word, but...

"joyaux" (pronounced "zhwa-yo") is the plural of "joyau", which means jewel.