Quote Originally Posted by Cobblemaniac View Post
Iirc there's an earlier indication: the door glows silver with rare, gold with SR, and rainbow with SSR. Found it from the JP wiki, but I haven't pulled an SSR to confirm that
In here, if the light glows golden means SSR, if it glows Blue, means SR, if it glows Pink means R and below.

Golden Door means SSR or SR and White-ish Door means R or below.