Mr Diamond from Craigiebank described the artist’s unfinished wooden carving as “a masterpiece”.
“I don’t know how he did it, the man was a genius,” the 74-year-old said. “It’s a beautiful thing. It is very well done and everything fits perfectly.”
Mr Diamond believes the work had been commissioned and hopes whoever originally wanted the piece will come forward to claim it.
He said: “It’s a bit of a mystery, there is no paperwork in the house or anything.
“If nobody owns up, we’ll just donate it to a trust in Edinburgh.”
Last week, Styles, 21, was locked up for life after he admitted stabbing the artist 19 times in a frenzied, drug-fuelled attack.