Alright, for my third guess (that was technically my second but whatev)...
Mars crest/sigil
It's neither.
HintHowever, the answer is two words long.
then what about petrify grenades?
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Electro Marble/Lightning Marble/Lightning Gem ?
Candle of life?xx
Tetra [strike]Shield[/strike] Ring
EDIT: Too slow.
Neither Tetra Shield nor Tetra Ring.
Tetra Bracer
we might as well start naming off all of the equipment that starts with tetra lol
Yeah...
Tetra Bangle
I don't know how the carbon things would really tie into a random piece of armor.
Tetra Armlet