I believe that these are the precious gifts they boys gave to their ladies:
Leonard gave Penny a preserved snowflake from the North Pole.
Sheldon gave his girlfriend, Amy a tiara.
Howard gave her fiancee, Bernadette a star necklace.
This only shows that geeks can be really sweet and romantic if they want to.
Plus, they can really show their pure and sincere love for the person they really care for.
It actually shows how the guys see these wonderful women:
Penny isn’t some random blonde, she’s one of a kind
Amy isn’t Sheldon’s girlfriend, she’s his princess
Bernadette may be small, but she shines the brightest