It doesn't make any sense.
1: Her gem doesn't look like a nephrite, it looks like a trapiche emerald. this is the most obvious one.
2: Nephrites were shown to have sharp, spikey, geometric hair in "jungle moon", centipeetle's is soft, it looks more like emeralds.
3: The fur around her neck, again, is like emerald's fur.
4: Her gem is an eye, and it's implied all other nephrites have gem eyes. Nephrite stones are mostly opaque, a gem as thick as nephrites in the show would have barely any light pass through it. You know what gem is mostly clear? Emerald.
5: The emerald we saw had her gem on her eye, furthering centipeetle's connection to emerald.
Literally the only connection centipeetle previously had to the gem nephrite was that she was a pilot, as nephrites were mentioned to be. However, Emeralds also seem to be pilots, so...
What's the deal? Will it be revealed that Nephrites are really emeralds and homeworld was lying to them or something? I can't make sense of it otherwise.