If you have the financial means to invest in rare coins and precious metals, make sure you've made room in your collection to include platinum. The metal is a rare, scarce and costly commodity that has many unique properties. In nature, platinum is often found as part of the Platinum Group Metals (PGMs), along with other metals such as gold, nickel or copper, according to the United Nations Conference on Trade and Development (UNCTAD).

Platinum is a diverse precious metal that has many usages in the world today. In fact, according to the UNCTAD, 20 percent of the goods manufactured worldwide contain platinum or are produced using platinum. It is essential for how societies across the globe operate, and collectors have found platinum coins to be an influential part of their portfolios.

If you want to include platinum in your rare coin collection, consider investing in the 2007 10th Anniversary United States Mint Platinum Eagle Set. The U.S. Mint produced a limited quantity of these platinum coins - 10,000 two coin sets to be exact.

The 2007 Platinum Eagle set marked the first ever Reverse Proof Platinum coin in the United States, and due to the uniqueness of this coin and a low mintage amount, the set is projected to continue increasing in value for years to come.

You may want to consider how platinum holds worth of its own when looking for new precious metals to add to your collection. As the world continues to embrace these metals in technology, medicine and design, owning some of the commodities will become all the more popular among investors. If you want to get a head start and build an expansive portfolio of valuable metals, look to rare coins for their worth and beauty today.