The Selkie's Diamonds by Morag Gray
Series: The Realms, Book 2.
Approx. 57,150 words.
Published on December 3, 2011.
When Rebekah is given a pair of diamond earrings for her soon-to-be wed cousin Emma, she has no idea that the earrings will draw her into a world she had believed imaginary, and that the responibility for saving Emma's life will fall on her.