Diamonds Aren't an Investor's Best Friend

A drooping dollar and inflation worries have bolstered the price of gold and other commodities that are generally considered robust investments in rocky times.

Do diamonds share the same luster?

In most cases, no. Some investors buy diamonds in the form of mining company stocks, many of which are not listed on an organized exchange or on Nasdaq; a larger diamond-mining company, Mountain Province Diamonds (MDM Quote - Cramer on MDM - Stock Picks) is listed -- and is up 51% so far this year. The bump appears to be based more on speculation, however, because the company's mine isn't yet producing. You can also get exposure to the diamond market through jewelry company stocks such as Tiffany & Co. (TIF Quote - Cramer on TIF - Stock Picks) or Zale (ZLC Quote - Cramer on ZLC - Stock Picks).

But for most people, diamonds are bought and sold through a jeweler. Many a groom has found himself convinced to spend a big chunk of his yearly salary because of the stone's perceived "investment" benefits. But for those who think they might be able to resell individual diamonds at a profit, the chances are mighty slim. Diamonds usually are a way to spend money -- sometimes a lot of money -- not make it.

Crystallized carbon -- what we call diamonds -- is rarer than other forms of carbon, such as the carbon dioxide gas that wreaks havoc with global temperatures. Elemental carbon in all forms, however, is a common substance. It's in food, clothes and gasoline. Under intense heat and pressure, elemental carbon can form gorgeous diamond crystals, but those conditions can be duplicated in a laboratory. As technology improves, it's likely that more and more man-made diamonds will come onto the market.

Stores of Value

Diamonds are sometimes lumped together with gold and other precious metals when investors seek safety in volatile markets -- not because they trade like gold, but because they are often considered to be similar rare and valuable substances. These materials are seen as stores of value, expected to keep their worth when other investments falter.

In financial terms, a store of value is a commodity with no cash flows. Its price is expected to increase along with inflation. Common stores of value include precious metals and undeveloped land. Stores of value are generally low-risk ways to hedge one's purchasing power; as an added advantage, most of these materials can be owned in useful forms. Land can be owned as part of a housing or commercial building. Precious metals can be owned as coins, jewelry or spoons.

Precious stones also can serve as stores of value. But here's the rub: Precious stones don't trade freely. There's no afternoon price fix and no quote to look up. Much of the value of a precious stone is determined by appraisers from competing trade organizations, who can be subjective in their analysis. One person's opinion, no matter how learned, is no match for the power of the market to determine prices. This means that diamond sellers can get different appraisals, and different offers, for stones that in theory are fungible. Many jewelers avoid dealing with secondhand diamonds for fear of casting a pall on the market mystique, but plenty of jilted brides have found a great secondary market on eBay.

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