Werner Lippe was convicted in October of incinerating Faith Lippe in an oil drum after knocking her unconscious with a piece of lumber in 2008.
Lippe, who made jewelry for Donald Trump and Yoko Ono, made an unrepentant argument for his innocence Tuesday.
The Lippes were negotiating divorce when she disappeared. They had two teenage children.
Werner Lippe confessed three times to the killing - jurors heard the recordings - but recanted. He testified that he last saw his wife being driven away from their home in a New York City suburb.
His first trial ended with a hung jury.