How do you know if it's real gold?

Related questions

1. Does cubic zirconia turn green?
2. Is a gold filled worth anything?
3. Can you wear 14k gold in the shower?
4. Which gold is better 18k or 24k?
5. What length chain should I get?
6. Will Vermeil wear off?
7. What's the difference between 18 karat gold and 14 karat gold?
8. Which is better gold plated or Vermeil?
9. What is a tennis chain?
10. What does a belcher chain look like?

Tags

1. #using
2. #noticeable
3. #check
4. #dropper
5. #small
6. #probably
7. #choose
8. #possible
9. #perform
10. #reaction
11. #light
12. #there
13. #piece
14. #apply
15. #nitric
16. #scratch