Hi, I can't tell you about the Tiffany atlas cuff, but I can tell you about my stack.
My wrist is 14cm on top of bone. I have small bone and small wrists. I got my 4
Diamond YG bracelet size 17 for 2 reasons. First I have accumulated about 8 clics PM 7 are Gold toned. These clics in size Pm are shaped like the love and I think measure 17 cm exactly. So they pair perfectly with a 17 love bracelet. I also have 3 thin diamond bangles that are Meant to be opened but I slide them on and off and are also size 17.
I also can squeeze the 17 off my smallish hand. But... That being said the 17 by itself on my wrist moves a lot and kinda hangs down my wrist area of my right hand and well gets a little annoying. I am right handed. I can't wear it on my Left hand above my watch because it kinda slides over my watch. I am very happy I got it in 17 for the reasons I gave, but I am saving up to get a plain YG in 16 so that I can wear it maybe on my left wrist behind my watch or maybe right hand alone. I'm afraid my h clics will slide over the 16 and scratch it. So sorry such a long explanation. Just wanted to help I have yet to see someone actually say they wear 2 different size loves together and that they are comfortable and scratch resistant.