I have not purchased much jewelery in the Grand Bazaar in the past five years. I think it is a good place to purchase jewelry, but I have encountered a couple of salesmen who misrepresented their products and it has made me a bit more hesitant to spend money there. Last month I purchased a ring for my grand-daughter in the Grand Bazaar. The jeweler assured me that the three tiny stones in the ring were diamonds. When I took the ring back to the hotel and tested the diamonds they were, in fact, not real. I took the ring back along with my diamond tester, and the jeweler did replace the fake stones with diamonds, but it damaged his credibility with me.
I have purchased about $2000 worth of exquisite gold and silver jewelry in the Arasta Bazaar in the past four years from Ruyam Kuyumculuk, Arasta Carsisi No. 105-153. He often has some exceptionally unique designs, and is prices are fair. I have never purchased anything from him that has not appraised much higher than what I paid for it. He is an elegant man who works alone and seems to be in his store every day of the week. There is very little bargaining space in his quoted prices because he does not create a huge mark-up in the first place.
On the other side of the street in the Arasta Bazaar is a small store called Pasha. The man who owns this store does much of his own work. We have purchased about the same amount of jewelry from him, and are similarly comfortable with his ethics. Many of his designs are more ethnic than I like, but hidden among these pieces there are always a few elegant items that catch my eye.
I am positive that either of these stores in the Arasta Bazaar would be great places to look for unique pieces of jewelry. Neither of them have a huge inventory so selection is limited, but everything you purchase is authentic.