History

Diamondheart facing off with Dust
Diamondheart now remains in her organic diamond form most of the time. In this form, she was far less vulnerable to attacks. However, it appeared Emma was still unable to access her telepathic abilities in her organic diamond form.
Diamondheart also has taken on the care of the decrepit Ink. Ink couldn't or wouldn't speak, and for unknown reasons Diamondheart didn't use telepathy to communicate with him (possibly because of her unwillingness to change from her organic diamond form or his lack of consent).
When Dust attack the remaining X-Men at X-Men Tower on Xaviera, she murdered Diamondheart by creating a whirlwind around her thereby suffocating her.[1]