Everyone on this board (experts - amateurs) work together so well in helping one another out. I have been sitting back and researching diamonds and rings for nearly six months and this site is the premiere place for straight forward information. Today, I finally purchased the ring. Cartier 1895 Emerald Cut Solitaire. The dimensions make the stone look more rectangular than square (7.41 X 5.01 X 3.51). 1.25 carat F VVS2 I''ve looked at alot of settings and the combination of the basket 4 prong and the narrow platinum band is very elegant. The next thing for me to do is give it to my girlfriend (she has no idea). My question is what is meant by the thickness of the Girdle?