Because of their beauty, historical significance, and scarcity, silver and gold coins are popular objects to collect and cherish. When looking for new pieces, you might come across coinage discovered in shipwrecks. Submersion in saltwater impacts the coin’s surface, and this is known as the shipwreck effect. To ensure you properly evaluate coins, here’s what you should know about water’s effect on different metals and the grading process.  

What Metals Are Most Affected By Water Exposure?

Metals have different properties, which makes some more resistant to certain environments than others. Many shipwreck artifacts spend centuries on the ocean floor, exposed to salt, acid, microorganisms, and sea life. Gold coins are rarely impacted by these conditions, showing minimal or no signs of corrosion. Copper and silver coins, however, will corrode quickly in these conditions.   

What Grading Standards Are Used to Authenticate Shipwreck Coinage?

As some gold coins might not show signs of prolonged submersion in saltwater, they are evaluated using the 70-point, numerical NGC Coin Grading Scale. Otherwise, a separate grading standard is used for coins that show signs of the shipwreck effect. The scale is used as a guide for coin dealers to certify and authenticate these types of coins. 

With the alphabetical grading standard, Shipwreck Effect A is classified as a coin with strong visual appeal and minimal surface wear from saltwater. The Shipwreck Effect B category indicates the coin has light surface wear and other minor damage but it doesn’t impact the design elements. The Shipwreck Effect C classification suggests moderate damage and average appeal. Coins in the last category, just called Shipwreck Effect, show severe signs of wear and corrosion. The damage makes it difficult or impossible to conclude what it looked like prior to submersion in saltwater. 

Whether you’re an avid coin collector or recently started the hobby, Coins & Stuff in High Point, NC, is home to a treasure trove of remarkable silver and gold coins and estate jewelry. Their team of pawnbrokers prides themselves on excellent customer service and fair prices, whether you’re buying or selling your goods. In addition, the shop is a member of the Professional Coin Grading Service (PCGS), ensuring your rare find will be authentic and certified. Call (336) 885-5323 to speak to a knowledgeable member of the team or visit the coin dealers online to learn more about the buying and selling process.