Conversation so far:
when do we find out garnet is a fusion
Viewers learn that Garnet is a fusion in the first-season finale, Jail Break, but foreshadowing in earlier episodes led many viewers to suspect it before it was revealed
what fusion was the character garnet a part of
Garnet is a fusion — i.e., two Gems combining personalities and appearances as one shared holographic body — formed by two Gems named Ruby and Sapphire.
how was the relationship of ruby and saphire before the fusion of the character
Ruby is characterized as a feisty and aggressive fighter, while Sapphire is a stoic and contemplative oracle, resulting in a complex dynamic between them.
who voices the character garnet
Garnet is voiced by Estelle, a performance that has seen a positive reception.

Question: what is the character made out of
Self-contained rewrite: what is the character garnet made out of