What do these three things have in common: Diamonds, Dogs, and Double plays?

“They all start with the letter D”

While it's true that all three words start with the letter D, this answer does not capture the essence of their commonality, which is based on cultural sayings and relationships rather than just a shared letter.

“They all symbolize loyalty”

Although dogs are commonly associated with loyalty, diamonds and double plays do not inherently symbolize loyalty. This answer overlooks the specific phrases that connect the items.

“They are all expensive”

While diamonds can be expensive and some dog breeds may cost a lot, double plays do not have a monetary value associated. This answer fails to connect the items through their cultural significance.