Based on your post, the value of the ring is most likely over $950.00. If so, the person who took the ring and admitted in a voice mail to having it, may be charged with grand theft
However, the person who owns the ring must make a police report
. The matter would be investigated and if there was enough evidence that the person took the ring and kept it after being asked by the owner to return it, then the case would be presented to the state prosecutor.
The state prosecutor would then decide if there was enough evidence to prove that a crime was committed and that the person committed the crime. If so, the prosecutor would then determine what charge would be authorized against the person.
Below is a link to an article that explains the California Criminal
Statute that applies to theft and the different things that the prosecutor has to prove to charge a person with one of the theft crimes provided in the statute.http://statelaws.findlaw.com/california-law/california-theft-larceny-law.html
I hope you find the information useful.
My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back. I am happy to address follow-up questions. If you are satisfied with my answer, please rate it as "excellent" or in another positive manner. That is the only way that I can get credit for answering the question.
Thank you for your business!