: Valued for rarity, condition, and historical significance.
: Coins like common-date $20 Saint-Gaudens Double Eagles that carry a small premium over gold content but aren't strictly "rare". buy rare gold coins
: Rarity (low mintage/survival), Condition (grade), Demand, and Historical Significance. 2. Authentication & Grading (Your First Line of Defense) : Valued for rarity, condition, and historical significance