According to Old Currency, LLC, a $10 gold certificate is worth about $75. There are several factors that can affect the selling price, such as whether or not the bill came from an uncirculated block. $10 gold certificates printed from the uncirculated BA block tend to carry a higher premium.
The 1928 $10 gold certificate is one of the most common certificates that were released. The gold certificates with stars tend to fetch even higher prices at auctions. A lightly circulated $10 gold certificate with a star from the A block can sell for over $300. Uncirculated certificates from the star A block can sell for over $1,500.