The price for a single bitcoin exceeded the price of an ounce of gold for the first time ever Thursday, but the digital currency isn’t ready to join gold or silver as a reliable long term store of value, Paul Mladjenovic, author of “Precious Metals Investing for Dummies,” told MarketWatch.

“I want to see a lot more stability and I want to see that [bitcoin] has the same characteristics of durability that gold and silver have had over not just years but centuries,” Mladjenovic said in a Facebook Live interview.