nicotineandcaffeine
Active Member
Don't rely on ping tests, or any test in isolation.
Gold standard is XRF plus one of water density, vernier calipers, weight on scales or sigma pro
Any single test in isolation can give you grief, even XRF on good looking plated fakes or sigma pro on some alloys
+your eyes
Good post 66, no test is perfect including conductivity and xray
."Bargains" on ebay & gumtree are generally a con for sure. I would not discount them completely as there are bona fide sellers.
In the last month I have 2 new gold and 1 platinum coins from eBay. Under spot, one by a significant margin.
Honestly though if I hadn't been looking specifically for these coins I wouldn't waste time saving.a few hundred bucks.