Gold (GC=F) futures opened with a rocky start on Friday due to an outage that suppressed live pricing. The price of the precious metal eclipsed $4,200 after remaining below $4,100 for most of November.

The outage prompted wider bid-ask spreads on gold futures contracts. The bid-ask spread is the difference between buy and sell prices. It’s relevant because a wider spread puts buyers and sellers in a weaker position. Buyers immediately face a larger gap between what they paid and what they can sell the contract for, while sellers may have to wait longer to get the price they want. Gold’s spread temporarily rose to $20 an ounce before retreating. The spread is normally around $1 an ounce.

Learn more: Gold Heads Higher as Trading Resumes After CME Outage Headache

The price of gold futures on Friday morning was 4.3% higher than Monday’s open. Here’s a look at how the gold price has changed versus last week, month, and year:

One week ago: +5.1%

One month ago: +7.8%

One year ago: +60.9%

On Nov. 14, gold’s one-year gain was 63.4%.

24/7 gold price tracking: Don’t forget you can monitor the current price of gold on Yahoo Finance 24 hours a day, seven days a week.

Want to learn more about the current top-performing companies in the gold industry? Explore a list of the top-performing companies in the gold industry using the Yahoo Finance Screener. You can create your own screeners with over 150 different screening criteria.

Learn more: Gold vs. crypto: Which should investors own in debasement trade?

A gold investment can add stability and inflation protection to your portfolio. But it can also dilute your gains when stock prices are rising quickly. Finding the right balance between gold’s diversification benefits and profiting from growth potential in other assets can be challenging.

Even the experts are divided on how to achieve the correct balance. Below, five experts explain their recommended gold allocations, which range from 0% to 20%.

Learn more: How to invest in gold in 4 steps

Robert R. Johnson, professor at Creighton University’s Heider College of Business, does not advocate gold investing. In his words, “while having a small position in precious metals may dampen portfolio volatility in the short-run, the tradeoff between slightly dampened volatility and the lost long-term return is certainly not a prudent one, particularly for Gen Z/millennials with long investing time horizons.”

Brett Elliott, director of content and SEO at American Precious Metals Exchange (APMEX), recommends setting an allocation that aligns with your investing goals.

Growth-oriented investors may be comfortable with an allocation of 10% or 15%, according to Elliott. But income investors will prefer a smaller position, because gold provides no yield. A 2% to 5% gold allocation can provide some resiliency without an excessive drag on income potential.

Learn more: Who decides what gold is worth? How gold prices are determined.

Blake McLaughlin, executive vice president at Axcap Ventures, said historical data support a gold allocation of 5% to 8%. “Gold may not offer the outsized return potential of private investments, but the metal holds a set of attributes that are increasingly hard to ignore,” according to McLaughlin. Those attributes include the metal’s resilience amid economic uncertainty and geopolitical unrest.

Thomas Winmill, portfolio manager at Midas Funds, believes most investors will benefit from a long-term gold allocation of 5% to 15%. Winmill specifically advocates investing in gold mining companies through a mutual fund.

Your risk tolerance and current mix of financial versus hard assets can guide you to an appropriate allocation, according to Winmill.

Risk tolerance. Keep your allocation percentage low if you tend to panic in volatile cycles.

Financial vs. hard assets. Financial assets are stocks and bonds. Hard assets include tangible items like real estate, gold, collectibles, classic cars, and equipment. If you have no home equity and your wealth is primarily in financial assets, you can set your gold allocation higher. Or, if your home is paid for and more valuable than your stock portfolio, gold investing may not be necessary.

Learn more: Thinking of buying gold? Here’s what investors should watch for.

Vince Stanzione, CEO and founder at First Information, recommends a 20% gold allocation, specifically in physical gold or a gold ETF. Stanzione argues for a higher exposure to gold as a wealth protection strategy. As he says, “gold keeps with inflation and gold retains its purchasing power,” while paper currencies are devaluing around the world.

Learn more: Gold IRA: Benefits, risks, and how it differs from a traditional IRA

Whether you’re tracking the price of gold since last month or last year, the price-of-gold chart below shows the precious metal’s steady upward climb in value.