Do you like investing in tangible assets, things you can hold in your hand? Gold isn't your only option.

Although gold can help you diversify your investment portfolio, investing in gold comes with some with risks, especially since gold prices tend to fluctuate. Lucky for you, there are other options.

Fine watches: Watches are not a traditional investment. If you are looking for a safe and solid investment, mutual funds are a better choice. But for investors who like to own something tangible that will hold its value over time, classic watches can be a good choice.

In particular, Rolexes are the best choice for investors looking for a safe watch investment, said Paul Altieri, a vintage watch dealer and founder of Bob’s Watches in Huntington Beach, California.

Jewelry: Investing in jewelry is often related to investing in gold, since a lot of jewelry contains gold. But jewelry also contains other elements, such as diamonds. The American Jewelry Institute notes that over the last 20 years, jewelry containing diamonds of the highest quality has been breaking records at auctions by major art houses.

That’s not to say you can simply walk into a jewelry store and walk out with a ring that will be more valuable in a year. However, it’s possible to make a smart investment in jewelry that can beat the returns on gold.

Antique weapons: The price of guns on both the primary and secondary markets has been skyrocketing in recent years. Meanwhile, antique weapons are another alternative investment that has done very well.

Classic cars: Classic cars are a fun investment collectible, and their return has trounced the value of gold in the past few years. Even as gold continued to slide, classic cars increased in value by 40 percent in 2014, according to an index published by U.K. private bank Coutts.

Coins: Collecting in coins has long been a popular hobby. But it might be on the verge of becoming a common investment too, according to some experts.

As with collecting jewelry, the value of a coin collection is often closely linked to gold prices. However, truly rare and sought-after coins are valuable not for their gold content but for the rarity and desirability of the coin itself.