This chain is exactly what you should expect if you understand 2mm. I would suggest that if mm doesnt register for you, that you take out a chain you do like, get a ruler, and use the cm side to figure out what the size is of that chain. I put a rather large arabic karkush that is over an inch long and maybe a quarter of an inch thick square. I got a 18" necklace and it is more then thick enough to look like it belongs with the pendant. I do wish I had gotten it in 20" as I always thought the other necklace made it hang too low and believed it was a 20". Now I got this one and know it is 18", I went back and measured the other and it was really a 22" necklace. Before you order a necklace offline, I do suggest you measure the one you are replacing or just a necklace you have to gauge if this is going to be too thick or too thin, and if too long or too short.

It is though exactly what they describe. It looks sturdy and the clasp doesnt look to be flimsy like some cheap necklaces. Am happy with it and happy with the price that I paid.