President and CEO of Bullion Shark. “Rare gold coins like the 1927-D $20 gold Saint-Gaudens could have been bought in the ’70s for $60,000 and now are worth well over $3,000,000.” ...

1925-D Lincoln Penny ($21,600): Brown varieties of this coin are often more affordable than red varieties, according to Bullion Shark. Values of all varieties can range from $2,000 to $75,000.

Shark Tank’s Kevin O’Leary teams up with Universal Coin & Bullion to champion gold as a cornerstone of wealth preservation.