How to identify the real gold necklace

For those who want to buy gold necklaces, here are useful tips to tell you how to identify the real gold necklaces. If you have just bought one piece of gold necklaces, the instructions below will help you to find out the truth.
As for the gold pieces, there are number markings on the jewelry indicating the karat amount. On necklaces, the markings are stamped on the clasp. Sometimes, there is scientific abbreviation for gold, which are letters reading "AU". If it is a real gold necklace, the numbers stamped includes 10k, 14k, 18k, or 22k.
It you still have doubts, you could use a magnet to attract your gold necklace. The necklaces contain other metals will be attracted.
Or you could take your gold necklace for professional advices. When you buy gold necklaces, you could ask the jeweler to offer the information. Also you could go to jewelry to have a chemical test.
The most important is you should buy from a reputable jewelry store. If not, you are suggested to buy Nitric acid test kit, which is useful to identify the real gold jewelry.
Since the gold jewelry is expensive, when you buy gold necklace, it's good to tell whether a necklace is real. Remembering these, you will buy the gold jewelry with more confidence.