I tried to send you a PM, because I didn't want to post what I am now about to, here, but you do not have enough posts to be eligible to receive, or, send PM's.
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Essentially, just about everyone agrees with you. Neither the Explorer nor the Excal are good on small gold. You might see if the Xterra 705 is better, do believe that I heard that.
Both Excals and Explorers, and even my Safari, are not the best when it comes to finding small gram gold and small fine gold jewelry like gold ear ring studs, and fine gold chains. Although, they say that if there is a pendant attached, that you can find the gold chains.
I did a web search and found this link http://metaldetectingforum.com/showthread.php?t=30253
The guy had the same problem as you do with his Explorer. He did some tests and some tweaking. You may find what he has reported to be of interest to you.
Other than that. The Explorer is an excellent machine. It will find the gold rings, it just has a problem with small gold and gold chains. The Explorer is a very versitale machine. You might explore the coil options. Keep checking the classifieds here on FINDMALL.
I think that his link will take you to the coil selection guide at MINELAB. Look at all the coils available for the Explorer and see if one is suited for finding gold. Can't remember if it is a high frequency, or, a low frequency coil that is best for that, but the guide will tell you...
http://www.minelab.com/__files/f/117...tion_Guide.pdf