The Mars Crystal is Rei Hino's Sailor Crystal, the ruby-red gem that raises her transformation to Super Sailor Mars and later Eternal Sailor Mars. It surfaces during the manga's Dream arc and the film Sailor Moon Eternal, handed to her by her crow guardians at the moment she is cornered by two Dead Moon attackers.
Within the Sailor Moon manga and the film Sailor Moon Eternal, the Mars Crystal represents the true Sailor Crystal at the core of Rei Hino's power. Its deep ruby coloring marks it as the planetary gem tied to Mars, and it belongs to the set of upgraded crystals that the inner guardians awaken during the Dream storyline.
Holding the crystal lets Rei reach her stronger states, first Super Sailor Mars and afterward Eternal Sailor Mars. The shift is triggered by the call of Mars Crystal Power, Make Up. Rei comes into possession of the gem through Phobos and Deimos, who deliver it while she is trapped and assaulted by PallaPalla and Tiger's Eye inside the mirror house.

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The Mars Crystal is Rei Hino's Sailor Crystal, a ruby red gem that lies at the core of her power as Sailor Mars.
The Mars Crystal lets Rei Hino transform into Super Sailor Mars and later Eternal Sailor Mars.
Rei Hino triggers her transformation with the Mars Crystal by calling out Mars Crystal Power, Make Up.
Rei Hino receives the Mars Crystal from her guardian crows Phobos and Deimos while she is trapped and attacked inside a mirror house by PallaPalla and Tiger's Eye.
The Mars Crystal first appears in the manga's Act 41, Dream 3, Mars Dream, with its first animated appearance in the film Sailor Moon Eternal.
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