Heart of Gold Organic Melon Seeds 4120 Heirloom Vegetable. Heart of Gold is an aromatic, sweet, deep orange fleshed melon. Expect the round fruit to range in size from 12.5 cm to 16.5 cm (5-7″) in diameter with a seed cavity that is relatively small. The rind is green with a heavily netted grey outer skin. Melons average 1.5 kg (3.3 lbs) weight at harvest. Heart of Gold is another heirloom that has been grown for over 100 years!