This is the 5807th most frequent Catalan word.
gema
"Yolk" (the yellow part of an egg).
'Gema' is used here to mean 'gemstone,' referring to a precious or semiprecious stone.
La gema del collaret brillava amb força.
The gem of the necklace shone brightly.
In this context, 'gema' refers to the 'egg yolk' specifically.
M'agrada separar la gema del rovell en les meves receptes.
I like to separate the yolk from the white in my recipes.
Here, 'gema' is used metaphorically to describe the sunlight as a precious and beautiful item.