One of the most valuable baseball cards today is the 1952 Topps Mickey Mantle in Near Mint to Mint condition. Mint condition means the card looks perfect, as if it was just pulled from a fresh pack. Mantle is widely considered the greatest switch hitter of all time, and his rookie card from Topps’ first series is arguably the most iconic baseball card ever. In high grades of NM-MT 8 to MT 10, the 1952 Topps Mantle can fetch $2-5 million at auction.

Other cards approaching or topping $1 million include the 1989 Upper Deck Ken Griffey Jr. rookie card and the 1988 Score Griffey rookie. Ken Griffey Jr. was one of the most gifted all-around players of his generation and is beloved by fans, making his rookies highly sought after. A PSA 10 1989 UD Griffey sold for $3.12 million in 2016. High-grade versions can sell for $500,000-$1 million still today.

Many of the best baseball cards to invest in today come from the late 1980s and early 90s. This was when the hobby first began to boom, with the introduction of new manufacturers like Upper Deck, Score, and Pinnacle changing the game. Rates of PSA 10 Gem Mint examples are also lower for cards from this era compared to the post-2000 era.

The 2001 Bowman Chrome Miguel Cabrera rookie refractor parallel /150 is considered the “holy grail” of modern cards. Cabrera is a likely future Hall of Famer and this parallel marks his true debut. A PSA 10 recently sold for $392,000, while high-grade non-refractor versions can still garner six figures. Other high-dollar 2000s rookies include the 2003 Bowman Chrome Albert Pujols refractor /999 ($180,000 PSA 10) and various Tom Brady cards from when he was drafted by the Montreal Expos in 1995, like his Premier rookie ($87,500 PSA 10).

In terms of active player cards, any big star who is almost certainly a future Hall of Famer and still producing at an elite level can carry value. Some examples include Mike Trout cards from his 2009 Bowman Chrome Draft Picks & Prospects rookie year, particularly rare parallels like the red refractor /99 ($58,200 PSA 10). Trout is largely considered the best all-around player today.

Other active star cards to watch include cards of Los Angeles Angels two-way star Shohei Ohtani from his 2018 Bowman Chrome & Paper rookie seasons. As one of the rare two-way stars modern MLB has seen, and still producing at an MVP level, his cards could grow substantially in value as his career progresses and he solidifies as an all-timer. An ’18 Bowman Chrome Ohtani autograph just sold for $47,500 in a PSA 10.

Rookie cards of current young stars like Juan Soto, Ronald Acuña Jr., and Vladimir Guerrero Jr. also carry a premium with the potential for strong long-term appreciation if those players continue developing into perennial All-Stars and MVP candidates. But the risk is also higher investing in active players who could suffer premature decline.

The for baseball cards to gain the most value, look for iconic all-time greats in their true, certified rookie seasons from the most prestigious brands like Topps, Upper Deck, or Bowman in top PSA grades of NM-MT 7 or above. Condition is king when it comes to long-term value appreciation over decades. With care and preservation, the best vintage and modern rookie cards could become million-dollar assets one day for savvy collectors.