Gold, Silver, Platinum, Palladium* are classified as precious metals due to their rarity, recyclability, and their utilization in industry processes, currency minting and adornment manufacturing. Another determining worth factor is their growing desirability as investment commodities.
*Chemical Elements are the naturally occurring fundamental building blocks of all natural substances and cannot be decomposed or broken down into simpler substances via chemical means. Each element consists of one kind of atoms and defined by its Atomic Number signifying the unique number of protons it possesses. (Palladium PD Atomic Number 46, Silver AG Atomic Number 47, Platinum PT Atomic Number 78 and Gold AU Atomic Number 79.
**(see iridium and rhodium)