Necklace 3.5 mm, about three grains of rice. The thickness of a gold necklace mainly depends on its length. If the standard length is 45cm, a 23g gold necklace will be about 2 .5mm to 3.5mm thick. If it is 40cm long, it is about 3 to 4mm thick. If it is a gold necklace with a length of more than 50cm, it is about 2 to 2 .5mm thick.

What is the material of necklaces?

Necklace is a chain jewelry made of gold, silver and jewelry. It is one of the ornaments of human body and the earliest jewelry. Some necklaces not only have decorative functions, but also have special display functions, such as prayer beads of Buddhist disciples and Catholic cross chains.