Coins including one or more external elements are part of this category. We keep a record of the following specific elements:

• Diamond : authentic diamond, usually natural.
• Zircon : zircon used in lieu of diamonds.
• Swarovski® : crystals looking like diamonds and produced by the Swarovski brand.
• Amber : natural or artificial amber.
• Titanium : metal, sometimes colorized.
• Jade : jadestone, sometimes carved.
• Glass : colorized glass.
• Opal : authentic Opal.
• Tantalum : metal.
• Niobium : grey metal, sometimes colorized.