I have found over 3 dozen gold rings split up between foil, nickels, tabs and lower zinc.
Broken or cracked rings of any kind will come in lower than the exact same ring that is a complete circle, just a effect we see due to different Eddy currents they will emit that rule all in this hobby.
White gold can sometimes come in way, way lower than even larger yellow gold identical rings depending on the alloys.
I use three detectors, one that is an Equinox, that will up-average many targets, including gold, if they are in the vicinity of any iron.
Don't assume...never assume when it comes to gold.