When I asked the shopkeeper, how could people differentiate between the lamps which were made in Turkey with the ones that came from China, he said that the colourful glasses of the local products should be much thicker.
I wish I could buy a few of those but bringing them home would be a problem. However, I still bought a small one as a souvenir (from this shop the night before I went back) and even though it was put in my luggage bag, it remained intact and safely placed temporarily on the dinner table in the dining hall.
TRAVELLING TIP: It would be very helpful for you to bring along bubble wrap plastic (and cellophane tape) when you go for a holiday if you think of buying products made of ceramic or glass, or even items which are fragile. You can buy the bubble wrap plastic from a stationery shop.