Heart of Gold Organic Melon Seeds 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.