The best way to get a certificate of authenticity for gold is to take it to a certified jewelry appraiser. There are other places, such as pawn shops and antique shops that may appraise the gold, but the most accurate would be a jeweler.
There are several test kit sites on the internet. For instance, there are about 14 testing kits on Ebay as of May 11, 2008. It appears that the most popular kit is an acid testing kit.
Only diamond can scratch diamond.
The authenticity of any gold items can be verified in a number of ways. First, check for any marks identifying the purity of gold. Fake gold can also have these, so do continue. If the gold colour is wearing off on the edges of the watch, it is probably not real gold. However, if you are unsure, just take it to a jeweller where they can assess it for you.
you have to do the tests
There are many companies that claim to have 26 carat gold available. However, it is not always possible to verify the authenticity of the company or their product.
Jewelry, coins and also tests are being done on using gold as an industrial catalyst
Spice Gold? Use the correct terms please.
The gold standard means it is the test or tests that all other tests are compared to. It is what is prefered or the "best test". Getting both a NCS and EMG for diagnosing CTS is the gold standard.
See if your finger can scratch the gold. If your finger nail can than you have pure gold. But because gold is weak like that the jewelry stores usually put other minerals to make it harder.
Go to a coin dealer or a jeweler, they have tests that will verify if the coin is gold or not.
Blood tests.
Investing in gold should start with researching the ways to test gold to be sure of it's purity and authenticity. You can buy gold in bars or coins. It is not advisable to buy online. It is better to go to a reputable local dealer.
The motto of Prometheus Society is 'Fire tests gold'.