Palladium is a member of the platinum group, a precious metal in platinum group metals, and the international imprint of palladium jewelry is Pd or palladium. Palladium is relatively stable, can resist acid corrosion, and is not easy to oxidize and lose luster under normal circumstances. Palladium has almost no impurities and high purity, which is very suitable for skin and jewelry. The international jewelry industry began to process palladium and platinum as components of gold, silver and platinum alloys to increase their hardness, and gradually formed a fashion trend.

The hardness of platinum is 4-4.5, and that of gold is 2.5; The density of platinum is 2 1.45g/cm3, and that of gold is 19.32g/cm3. The melting point of platinum is 1769 degrees Celsius, and that of gold is 1064 degrees Celsius. Platinum has stable chemical properties; At room temperature, it does not react with hydrochloric acid, nitric acid, sulfuric acid and organic acids. Known as "the most corrosion-resistant metal", it is soluble in aqua regia. Platinum has excellent oxidation resistance, good catalysis and pyroelectricity. Platinum can be drawn into thin wire with a diameter of 0.00 1mm and hammered into foil with a thickness of 0. 127mm, and 1g platinum will not break even if it is drawn into thin wire with a length of 1.6km. ..

Platinum can be made into jewelry alone, but in most cases it is combined with diamonds to make platinum diamond-encrusted jewelry.

There are extensive isomorphic substitutions between palladium and platinum. Pd and Pt have similar appearance and hardness, silvery white and metallic luster. Chemical properties are stable. Platinum and palladium are the two minerals with the smallest reserves in the platinum group, and they are also very rare.