Purity marks on gold jewelry will consist of a two-digit number followed by the letter “k,” or a three-digit number. A piece of jewelry with an etching that reads “18k” or “750” indicates that it is made up of 75 percent gold, while a “14k” or “585” mark indicates the metal is constructed with 58.5 percent gold.

When writing latitude and longitude, write latitude first, followed by a comma, and then longitude. For example, the above lines of latitude and longitude would be written as “15°N, 30°E.”

Live tracking and mapping High-end Jewelry tracking devices will not only give you a route map but also help you track real time information about the whereabouts of your jewelry. The GPS can keep the information of the route used to take your jewelry from one place to the other.

Each number stands for the percentage of purity of gold, platinum, and silver. For gold, the stamps are 375, 585, 750, 916, 990 and 999. For silver, the stamps are 800,925,958 and 999. For platinum, the stamps are 850, 900, 950 and 999.

2. Examine Your Vintage Jewelry Items

• After looking at the craftsmanship, consider the materials. A vintage and antique jewelry identification guide always focuses on materials.
• The cut of the gems can also point to specific eras.
• Check the clasps.
• Take the type into account.
• Look for evidence of the designer.

If the mark is: lion, symbol (town of Assay), R, Name or initials of maker, then it is British sterling silver. The letter “R” is a date indicator. You will have to go to the Encyclopedia of Silver Marks website to look up the mark.

Authentication Hallmarks International sellers of silver will stamp silver as 925, 900 or 800.” These numbers indicate the level of purity of the silver. Sterling silver has a purity of 92.5 percent or higher.