I have just begun to read this impressive first novel from Dapne Kalotay, but I am enjoying it so much (Kindle edition) that I just had to bring it to your attention.
From Amazon:
A mysterious jewel holds the key to a life-changing secret, in this breathtaking tale of love and art, betrayal and redemption.
A review:
http://www.washingtonpost.com/wp-dyn...090705567.html
Highly recommended.