as to what JimmyHAD said , i have a darker coti with a pink hue and what appears to be reddish/pinkish garnets that i would say is fast , hard , smooth feeling on the edge and is a great finisher on water alone .. but i also have a bout that is pale in color with a pink hue through the middle of it and is gritty feeling , soft and yet fast enough that i use to set bevels on all of my razors that dont need heavy bevel work then go to enie meanie , minie moe after , but again it has that pink hue to it like Jimmy stated so i dont know if its a set in stone theory or what but from mine that i have it stands up to what he said ..

as far as the bay goes , unless a stone has distinct feature it is gonna be a crap shoot as to what your getting . and most of the fun on a ebay coti is lapping it and finding whats beneath all those gouges , dirt , and age ...