Gold falls into the pulltab range and platinum falls into the foil range. We know foil is in the 0 to 8 or there abouts VDI's so what you want to do if you want to find gold and platinum is dig everything with a plus VDI.
24K is pure gold or 100% gold
21K is 21/24ths gold content or 87.5% gold
In the United States, jewelry with this karatage or higher is
rare. It is far more common in Europe, the Middle East and
Southeast Asia.
18K is 18/24ths gold content or 75% gold
This karatage is a popular high-end choice in the United
States, Europe and other regions. Its popularity is spreading
throughout North America.
14K is 14/24ths gold content or 58.5% gold
This is the most common gold karatage in the United States
because of its fine balance between gold content, durability
and affordability.
10K is 10/24ths gold content or 41.7% gold
This karatage is gaining popularity for its affordability and
durability. Commonly used in everyday-wear jewelry such as
rings, 10K gold beautifully withstands wear and tear. It is the
lowest gold content that can be legally marked or sold as gold
jewelry in the United States.