A heart is that organ which pumps blood through the veins. It is drawn in a stylized shape, much as found on modern valentines. The heart is found as an heraldic charge as early as c.1330, in the arms of Douglas [Wagner 50; also Gelre 64]. Mundanely, its “proper” coloration is red; Society practice would simply blazon it “gules”. See also seeblatt.
The Order of the Dragon’s Heart, of the Middle, bears: Argent, a heart vert scaly argent.
Malinda Angelanne Hohen van Kester bears: Per fess embattled azure and argent, a heart gules.
Sabiha al-Zarqa’ al-Karakiyya bears: Sable, in chief three hearts argent.
Teresa Maria Isabella Castro bears: Or, six hearts sable.