I remodel old jewellery in to new. I always state (verbally) that there are risks when stones are being recovered and when they are being reset.....however I don't put that in writing......thinking of a new set of Ts&Cs are in need as a general handout. I do state description of pieces I receive, yellow metal, hallmark, number and colour of stones but do not specify stone type nor do I guarantee carat of final piece (though verbally I give an indication given carats which are being combined. I also confirm details of new work and confirmation to proceed by email.....think I shall do some more thinking and work around this!!