Gold's price plunges below $4,000. Here's how investors can take advantage.

The price of gold is down around 10% from a recent high, thus opening up new opportunities for investors. Getty Images/iStockphoto

The gold price plunge may not be quite over.

The price of the metal declined 6% on October 21, its biggest single-day drop in more than a decade. It then rose slightly to close out the week, giving current investors a reason to be optimistic. But it now turns out that optimism was short-lived.

The price of gold on October 28 is now $3,931.80 per ounce. While still high compared to what it cost a few years ago, that marks a material drop for the shiny metal, which was priced at $4,356.21 per ounce just on October 20, according to American Hartford Gold . That marks an almost 10% decrease in less than 10 days. That drop is due to multiple facto