Gems are the small, low-stakes way to say something on Birthday Tribe when a full gift would be too much and a message would be too little.
What a gem actually is
A gem is a token you attach to a wish. It costs the sender something small, which is exactly what makes it register as deliberate rather than automatic.
Why small gestures carry
Across a distance, the size of a gesture matters less than its timing. Something that arrives on the day, from someone who did not have to, reads as generous regardless of what it cost.