Used to think a certain warm gray (some say 'pewter') was my favorite... until I saw a strand of small black pearls the color of Jet: charcoal black, with mysterious waves of dark blue and green iridescence peaking through in sunlight... Darn! I like all pearl colors!
I am not sure if there is a definite match with skin tone. Strong colors, high lustre seems to match everyone and delight everyone...