jack wrote:best i can suggest is price one up over here useing several jeweler,s then when over in icmeler/marmaris shop around there to see if any savings can be made or better quality the gold i have bought over there has up to now been 14c here in uk its usally 9c

To compare you also need to compare the diamonds because of what they call the cut, colour, clarity and carat. For example the clarity is the degree a diamond is free of blemishes and inclusions (blemishes are external - such as scratches, small nicks and inclusions are within the stone which have a greater impact on value). Because of this you can have a small diamond that's worth much more than a larger one. It's going to be very difficult do make a true comparison. As a family we have bought quite a number of diamonds including earrings, rings etc and are more than happy with the prices that we have paid. I don't really see how you can go around different jewellers and compare as you won't have the detailed information on the diamonds.
The best that I can suggest is that you use a recommended jeweller. We once bought a diamond ring from a jeweller in
Icmeler and when we had it valued for insurance purposes (the info given from the jeweller is not enough for insurance purposes) it was valued at the price we paid. Whilst we didn't lose on it, the jeweller had said that it was worth three times as much.
I agree with peevo there is a difference in the jewellers and we only buy from Firuze. They're also a family business run by Murat and Sona and you're guaranteed a good welcome whether you buy or not.