Check Out These Resources For More On Diamonds & Valuable Paper Artifacts


If you want to learn more about how diamonds are evaluated and how to preserve papers for archival purposes, check out the links below.  Contact Coins of the Realm in Rockville at (301) 340-1640 with your questions!

  • Antique and historical books are one example of valuable paper collectibles. One novel by the author of the Horatio Hornblower books was lost in 1935 and wasn’t seen again until a fan found it at an auction nearly 70 years later. Read The Guardian’s article for more details.
  • This link contains a great deal of information about the four C's of diamonds.
  • The Library of Congress offers wonderful tips about how to preserve paper artifacts.
  • For an in-depth look at the four Cs, visit the Gemological Institute of America’s website.

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Why Choose Coins of the Realm, Inc.?

  • Free storefront parking providing easy access.
  • Established in 1974 and still under original ownership and management providing decades of expertise in all aspects of buying and selling.
  • Financial Security – Since opening in April of 1974 every transaction of every size has been completed successfully without issue. Bank references available.
  • We provide accurate information in a professional no pressure environment allowing you to make sound decisions to sell, keep or buy collectibles and precious metals.