Photos would be awesome!!

(If you feel like fighting the impossible... xD)
But I'll try to give you a little list here...
Calico - Blue skin with red (or yellow/orange) and black spots, usually naucreous scales (matte and a few metallic here and there.) What's important when identifying a calico, is the BLUE skin.
Tri-colored - White skin with red, yellow or silvery spots + black. Scales can vary between metallic, matte and naucreous.
Sakura - Strong red and orange, reds are usually left on the back and head of the fish (+ tips of fins and occasionally, red lips)
Red - What most people call "gold"

Or "standard goldfish"
Silver - White goldfish (May have red eyes)
Yellow/Lemon - Really, really yellow fish.
Tancho (Japanese for "Red Crane") - A silver goldfish with a red spot on the top of the head, red-caps included.
Chocolate - This is a pretty hard color to describe, the fish looks pretty brown, and it can be warmer, colder or darker, lighter brown.
Blue and Purple - The fish will look pretty gray, but with slight blue or purple pigments.
Lavender - A lighter variety of the blue/purple color.
Any combination of two colors will simply be: Red-Black, Chocolate-Blue etc.
Here are a few photos of the more rare colors

Calico:
(Here you see the blue hint in the skin)
[image]
Yellow:
[image]
(Here you can see the yellow goldfish among a few red ones, you see the difference

)
[image]
Chocolate:
[image]
[image]
Blue:
(They can look pretty gray, as mentioned, but especially when they have chocolate colored spots, they'll look blue

)
[image]
Hope it helped! Ask if it was unclear or if you're just wondering about something more
