A Beverly Hills high-end jeweler bought the five-carat, emerald cut diamond for a reported $250,000.
An insider told Star magazine: "Ashton broke her heart. Anything that reminds her of him makes her sad, and she wants to be happy."
The couple tied the knot in 2005 and split in 2011 amid rumors that Kutcher cheated on Moore on their sixth wedding anniversary. Their divorce was finalized in November.
Kutcher is currently dating ...
The two bands will come together for a special show in L.A. in January to raise funds for Linkin Park's charity Music For Relief, an organization which provides aid to disaster areas.
The Concert for the Philippines event at the Club Nokia venue will bring in money to help those affected by Typhoon Haiyan, which ripped through the Asian country in November and left more than 5,000 dead.
More acts will be added to the line-up in the coming weeks.
Tickets for the ...