I've have found small jewelry with my Safari, like small Charms, small cross's, Obvious you must dig (ALL THE LOW NUMBERS) unfortunately that's where all the Foil - can slaw - Tabs, come in at.
The Safari (All FBS Machines) don't do all that good on Micro Jewelry, Like thin chains, with no Charms attached. To be fair most General purpose detectors out there All struggle on Micro Jewelry..... yes there's some that do better than others.
The VLF Gold detectors, like the Gold bug - F-19 - G2 with the higher frequency do much better on micro Jewelry. but one still must dig all The foil & low iron Rage and all the iffy signals. very time consuming task. i'll wait till i'm retired