In diamond business no one is going to give proof in advance as the material is not confirmed and second the procedure will be that first lab report from reputed lab like IGI and GIA is very essential for each piece then the material has to be taken to same lab for verification then only proof will be given and then business done within a week. Nobody going to give fund proof as business id required to be done by seller, and commission also will be on percentage basis not on per basis, also VVS1 and VS1 stones are not very costly stones but because of size it may fetch that price which can be confirmed only after inspection