Emma Silverfox was a young Canadian First Nations Mutant.
The younger sister of Kayla Silverfox, Emma became a mutant upon hitting puberty and found she was able to coat herself with an organic diamond substance. However, due to the interesting nature of her mutation, she was captured by William Stryker. Eventually she was freed by Remy LeBeau and saved by Charles Xavier, becoming a student at Xavier's School for Gifted Youngsters. However, all of these events came at the cost of Kayla, who sacrificed her life to insure Emma's.
Emma possessed the ability to coat herself with an organic diamond plating. This plating, similar to Piotr Rasputin's, was hard and strong, able to deflect bullets.