As gold surged this year to its highest price ever, Xena Lin joined the frenzy by making monthly purchases of gold “beans,” pebble-like morsels of the precious metal.

For Ms. Lin, a 25-year-old administrative worker in southern China, the $80 beans — small enough to rest on a fingertip and weighing about one-thirtieth of an ounce — were an affordable way to buy into the gold excitement without splurging for jewelry, gold bars or coins. She had dabbled with investing in stocks in the past, but she said buying gold, especially in this fun way, inspired her to continue investing.