A Quick Sprite Coloring Question

[W.H.I.T.E.O.U.T]

What are the gradients that're used in coloring sprites? I've tried looking in the old Sprite Art guide and I tried using the color picker tool of a photoshop software to try and get a rough estimate. Both methods weren't very helpful.

So, I'm asking this to see if I could get the gradients used for the grey paintjob of items as well as the element item glow effects. It definitely feels awkward for me to ask this but I feel like it's just as awkward to keep using solid grey colors and inaccurate element color gradients on my sprite ideas. 

I appreciate any help and assistance given. Thank you for reading this.