From the policy…'We will not cover any claims arising from:
Unsupervised luggage and personal effects;,
Does this mean rings accidentally left in hotel room while on a coach tour are not claimable?
Also I no longer have receipts will this be a problem?
Obviously they don't expect you to never leave anything in your room. It's more to say don't leave them somewhere where joe bloggs walking past in the street could pick them up.
There are a few examples if you search for your exact title in google that will point you in the right direction.
ie: Cover for luggage and personal effects