Murder on the Rocks, by Robert Dietrich (epub/Kindle/pdf)
Cool—that was Silvio, a junkie who turned on the heat when he took over another man's wife, and a fortune in jewels. Hot—that was the Madagascar Green, a chunk of 29-carat emerald whose legacy was sure, and sudden, death. Torrid—that was Iris, who made her own play for the stolen Green, and for the man willing and able to get it for her. I was the man. And, at least in the beginning, I was more than willing...