Although gold voucher are extremely low cost these days, you would still be a few thousands short unfortunately. Diamonds typically go for 90-120r while a gold voucher goes for 100,000-150,000r.
I'm somewhat convinced that the intent is the other way around The OP brings the diamonds and the other party the voucher.
Ill sell you a Diamond voucher for 215k if you are unsuccessful in finding someone who will do the type of trade you are seeking.
low on rupees? Work for it! Plenty of shops allow you to sell stuff and then you can have rupees! or vote (which you did!). You know what? ok.. important: 2 iron = 1 gold. Keep this in mind!! This deal is only for you Slimewarror (yuck! (just teasing!!)): gimme 40 diamonds and I give you 1 iron voucher. No: that is it. No more but I hope this might help you get up to speed to something more! lemme know Disclaimer: valid for 2 weeks from here on.