How do you test your gold? I just did the ping test on these coins and they failed. I bought from a reputable dealer online. How do you test your coins?

What are Gold Scams, How Can They be Avoided?

How Do You Check if a Gold Krugerrand Is Genuine? - MyGold

4 Ways to Tell if Gold Is Real - wikiHow

How To Tell If Gold Is Real: 11 Easy Ways To Ensure You Have The Real

The Ping Test - Silver - The Silver Forum

How to test if an old US coin is made of gold without destroying

Precious Coin Tester - Apps on Google Play

Silver and Gold Coin and Bar Ping Test Tool

Precious Coin Tester - Apps on Google Play

How to Tell If a Gold Chain Is Real or Fake - ItsHot

Testing two suspect silver coins (aka How to tie a string around a

Sounds of Brass vs Silver vs Gold Brass counterfeits won't always