rld
77
Pink and Rose Gold
To expand on what CR mentioned, technically rose gold and pink gold are not the same, though many people (myself included) often use the terms (as well as "red" gold) interchangeably. All three are 75% gold; red gold then has 25% Cu, while rose is 22.5% Cu and 2.5% Ag, and pink has 20% Cu and 5% Ag. To my knowledge, Lange has only described watches as being "pink gold", never as "rose gold" (does anyone know of exceptions?).
As others have mentioned, that suggests that any difference in the watches in the photos are artifacts of the photography, or due to development of patina.
I was not sure that I liked the combination of grey dial and pink gold in the new Lange 1 Perpetual until I saw it in the metal - it is gorgeous! And grey of course is the color Lange uses in boutiques, their catalog, etc.