Bill, I just did a google search on gold coins and depending on the type of lighting, the type of gold used, and the background, the same metal can take on a number of looks.  It can be orangish to very yellowish, from reflective to not so reflective.  So I can imagine how hard it might be trying to get it to look right in one condition much less multiple conditions.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)