At the moment, I'm working on these. They're both really interesting, but the diamond one is hard to put down. I don't usually read Kindle books on my phone because the screen sucks for reading, but I've been pulling it out every chance I get.
The Heartless Stone: A Journey Through the World of Diamonds, Deceit, and Desire - [ame="http://www.amazon.com/Heartless-Stone-Journey-Through-Diamonds-ebook/dp/B003J5UIWS"]Amazon link[/ame]
The Man Who Made Vermeers: Unvarnishing the Legend of Master Forger Han van Meegeren - [ame="http://www.amazon.com/Man-Who-Made-Vermeers-Unvarnishing-ebook/dp/B003WJQ7L2/"]Amazon link[/ame]