How wealthy investors bet on gold, from buying fractions of a bar to stashing bullions in Swiss military bunkers-turned-vaults

An employee handles one kilogram gold bullions at the YLG Bullion International Co. headquarters in Bangkok, Thailand, Dec. 22, 2023.A version of this article first appeared in CNBC's Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer. Sign up to receive future editions, straight to your inbox.With gold prices up roughly 25% this year, the precious metal is in such demand that Costco has capped how many gold bars shoppers can buy in a day. A recent HSBC su ...