You have a duty under the insurance contract to notify the insurance company, they will either require you to give them the ring or let you keep it.
Ring them
On insurance policies there is a section for 'contents' which should include your ring and you would have to send the receipt of the appraisal of your ring in when making a claim with your insurance company.
You need to contact your insurance agency immediately. You could be charged for theft. You will need to return the money.
It depends on the cost of the ring and the amount of your policy deductible. Most deductibles are at least $500.00. If your ring only cost $499.99, you will receive nothing from your company. If your ring cost $510.00, you will only receive $10 from your company. Even of you don't receive any money from the company you will have to admit that you filed a claim anytime you try to get insurance in the future. Take a look at your policy to determine the deductible and find out the cost of your ring.
You would need to inform the insurance company and reimburse them for the amount paid or give them the ring, your choice. If you don't inform them you are guilty of insurance fraud. This claim would have to be for a scheduled jewelry floater or payment would not have been made. The floater is the only policy that will pay for mysterious disappearance. A normal Homeowners policy without the floater would require proof of break-in to be theft. The floater also has no deductible usually. It does require appraisals of the items covered.
The issue really isn't whether or not you can prove who stole the ring; the issue for the claims adjuster is whether or not you are filing a fraudulent claim. If you, your wife, and other "insureds" in your household are not responsible for the missing ring then file a police report and let the police investigate. Once the report has been filed, call your insurance company and submit a claim. You will want to provide paper documentation (such as an appraisal or a receipt) that shows your name and the purchase price and/or replacement value of the item. You should also ask your company if your policy includes a "Reward Coverage". Reward Coverage usually offers a $500 reward to anyone who provides the police and/or insurance company with information that results in arrest of the guilty party. If you have this coverage you can then advertise that the reward is being offered. Again, if your property has been stolen then do not feel "bad" about filing a claim. Just follow all of the necessary steps.
If you have recently purchased an engagement ring for your fianc�, you should think about purchasing ring insurance. You should consider the ring insurance as part of the cost of purchasing the ring, as rings are easily lost and can be very expensive to replace. A ring insurance policy will also cover your loss if the ring is stolen or if any of the stones fall out of the setting and get lost. Ring insurance is a small price to pay when compared to the thousands of dollars that it would cost for you to completely replace the ring.
They would cover it if was stolen from your home. They would pay up to the sub-limit, usually 1K, then reduce that amount by your deductible. However, if you schedule the wedding ring onto your Homeowners policy it will be covered less the deductible for the entire purchase amount. An appraisal will need to be submitted to the insurance company. A claim filed for the loss or theft of this ring will count as a claim against the Homeowners Policy, which could raise the premiums. There are Personal Article Policies that will separately cover this piece of jewelery.
"Jewelers Mutual Insurance, State Farm Insurance, White Flash are just a sampling of insurance companies that provide engagement ring insurance for the consumer."
Though purchasing engagement ring insurance by putting it under your homeowners insurance is not necessary, depending on the value of the ring it is highly suggested.
Because he's filing for divorce!
I recommend that you would get insurance on the ring in case of the following situations. A diamond is knocked lose from the setting, the ring is lost or in the worst case she says no.