Shop › Mid Century carved jade diamond 18k yellow gold interchangeable brooch Image 1 of 1 Mid Century carved jade diamond 18k yellow gold interchangeable brooch $18,000.00 Mid Century 18k yellow gold brooch with carved jade and 3.20 carats of diamonds. Circa 1960s. Size 3 x 2 1/8 inches. Quantity: Add To Cart Added! Mid Century 18k yellow gold brooch with carved jade and 3.20 carats of diamonds. Circa 1960s. Size 3 x 2 1/8 inches.