Information, possibly danger and or a need for caution; the quaternary, and therefore, anything with fourfold quality. The shape may also be related to baseball.

As Diamonds as jewels it can signify purity; strength of character; attitudes of being hard or irrefutable. It is the birthstone of someone born in April. It also symbolizes something (message or attitude or emotion) enduring or valuable; therefore, it may relate to the spiritual aspect of your life; or to treasures (skills) lying dormant in your unconscious; the Self; Consider what happens to the diamond for additional clues;

See gem, jewl, self, treasure.