how can i repair a ceramic plate i brokein half?

a large 14"x14" round plate that a friend made me (ceramic), slid of the holder and broke in half. she made it especially for me, she painted a portrait of a woman in a hat on it... it was not a "straight, clean" break, it's a little crooked... how should i fix it. or should i bring it to a professional, since it has sentimental value. thank you, sue