Almonds are a stone fruit, too. It's just that the part we eat is inside the pit. Ever notice how almonds still in the shell kinda look like a peach pit?

Peaches and plums used to be cherry sized, too (and cherries are stone fruits as well, but selective breeding got the fruit-to-pit ratio better for peaches/plums/apricots/nectarines).

So some recipes call for processing cherry pits, and the flavor is pretty close to almond extract. Because almond extract is just bitter almonds processed in a similar way.