• 1). Avoid a deal that seems like it is too good to be true. The initial sign of fake gems is, usually, an obviously low price. Counterfeit gems often show up in tourist areas, especially at cruise ship ports where low prices attract buyers.
  
  
• 2). Get as close as you can to the gem using a loupe. A loupe is a magnifying glass, making it possible for the intricate details inside the gem to become more visible. The higher the magnification, the easier it is to spot the fake.
  
  
• 3). Look underneath the gem. Iit is absolutely necessary if the gem is mounted in a setting to remove it, then look at all of the sides. There are many deceptive practices that can be hidden by the setting, from painting the tip of the gem to make a color stand out or foiling a diamond to make it look more brilliant.
  
  
• 4). Look for uneven colors that could mean a poor dye or paint job. Stones such as opals are usually dyed to pass them off as higher priced blue opal.
  
  
• 5). Compare the known fakes with the real gems if you have access. First-hand experience makes spotting a fake a lot easier. Consider taking a gem workshop or class to gain access to samples.
  
  

Ask an Expert

• 1). Do not hesitate to ask the jeweler or dealer what type of gem is being purchased; ask whether it is an imitation, natural or synthetic. A reputable dealer will disclose the information and discuss the merits of each.
  
  
• 2). Pay to have the gem evaluated. Have a jeweler or dealer test the gem to see whether or not it is real; he will provide a certificate of authenticity. Some reputable dealers won't provide the service for free; check with the Gemological Institute closest to your location for the fee schedule.
  
  
• 3). Have the gem independently appraised before making the purchase. An outside dealer will spot the fake right away along with confirming the gem's value.