wholesale jewelry care I buy a diamond ring in Dubai, 0.34 carats, H color, SI clarity, unknown cut, no certificate, 18k platinum 4 grams. Mark 750, how much does it cost?

wholesale jewelry care I bought it at the most well -known Emirats Mall, but I didn't understand it at the time, and I didn't want the GIA certificate. There was only an invoice.
Right, please help your friends, in detail, it is best to have comparison in domestic stores, or commentary.