Please note, there is strong color change-- the color is best when viewed in indirect sunlight or equivalent lighting, and it looks rather sad in incandescent light.  The color on these is a bit  darker, even in sunlight. 

This one is probably one of the more temperamental ones when it comes to appearance in different lighting-- I think it is because the socorodite layer is a bit thinner, and the underlying limonite has dark and light patches.