Hi Kye, my dad used to be an indian jewellary retailer and wholesaler for twenty plus years...
"First of all my advise is by all means you can bring few samples of rings made in silver or gold but you must declare it at U.K. customs for V.A.T.\prupose.
Once you have done that you can do your marketing in U.K If you get orders let me know I will guide you how to import.
While you are in India make a contact with Chamber of commerce they will guide you and give you list of manufacturer who knows what sort of quality will be required for U.K. Moreover If you got time you can visit jewellery exhibitions to establish your contacts. "