20 Grams Gold Bar Australia Perth Mint (In Assay) Metal Content: 0.643 troy oz Purity: .9999 Fine Gold This 20g Gold bar is guaranteed .9999 fine and comes to you in an assay card that authenticates the Gold metal purity and weight. An efficient way to acquire Gold bullion, this Gold Bar is an ideal choice for investors wanting to increase their Gold holdings. Plastic assay can have small scratches.