I'm heading out later to search for a lost gold chain w/small links and I wanted to get some input on my coil choice. The necklace should be pretty shallow and I was contemplating whether to first use the 4x6, 5.3 or the 6x10. Yes, I will be bringing all three but I'd like to hear what others think the pro's and con's are between the three for this specific hunt. Supposedly it should be in a reasonably small area, maybe 3-400 sq.ft. Just curious to hear what others think. Thanks.