If you are wearing bulky gold, platinum, or sterling silver pieces, you may need to remove them to avoid setting off the metal detector alarm. Place jewelry containing liquid in a separate bin.
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You are more likely to set off the alarm wearing cheap costume jewelry, frequently made with magnetic metals, than fine gold and platinum jewelry. It is often advised that you leave your fine gold and platinum jewelry on your person as it is unlikely to cause the security system to react.
These airport scanners can also detect gold because gold is a metallic object with low conductivity, so the high-frequency radiation of the scanner will see it easily. It is impossible to hide things from airport scanners in your belongings because the scanner gives a clear image of metallic objects.
United States: The United States allows travelers to carry unlimited quantities of gold coins, bullion, or other monetary instruments. However, if you carry more than $10,000 in value, you must declare it to the U.S. Customs and Border Protection (CBP) upon arrival or departure.
There is no duty on gold coins, medals or bullion but these items must be declared to a Customs and Border Protection (CBP) Officer. Please note a FINCEN 105 form must be completed at the time of entry for monetary instruments over $10,000. This includes currency, ie. gold coins, valued over $10,000.
However, heavy jewelry with bulky metal components or multiple pieces can trigger the scanner. If you are wearing bulky gold, platinum, or sterling silver pieces, you may need to remove them to avoid setting off the metal detector alarm. Place jewelry containing liquid in a separate bin.
A dated copy of a jewelry appraisal, jewelry insurance policy or receipt can be used to prove ownership of the jewelry prior to your travels outside the United States. However, U.S. Customs and Border Protection (CBP) may accept a photo taken of you with the jewelry in your possession prior to your travels.
Put jewelry in a bag that you personally carry into restaurants and to your hotel room. And keep it with you at all times. Don't leave the jewelry in an unattended car or suitcase. Also, don't let the hotel staff handle the bag ... and potentially help themselves to your bling.