Methods to identify the authenticity of platinum:

1. Fire test.

Platinum is hard and resistant to high temperatures, so it will not be melted in a normal fire and will only turn red. If the composition is above 95%, the luster of the color will remain unchanged and will become brighter; if it becomes a little darker, it means the color is about 70%; fake platinum is completely Turn black.

2. Identification by weighing method and identification of imprints

Platinum is twice as heavy as silver in the same volume, and the weight of platinum rings of the same style is generally 120 times that of K platinum. In addition, platinum still has its unique mark pt, silver is s, and K platinum generally has a numerical value with k. ?

3. Specific weight

The specific gravity of platinum is much higher than other metals. It is 10% heavier than gold and heavier than other metals. We can combine the colors and weigh them with our hands. Generally, the heavier one is platinum.

Extended information:

Platinum

Identification

The most common white metals on the market are platinum and white K gold. They are white and easily confused, but they are actually two completely different metals.

Platinum (Pt for short) is a naturally pure white precious metal. It is naturally made of pure white color, so it can always maintain pure white luster and never fade.

The white color of white gold (commonly known as white gold) is not naturally formed. It is actually an alloy, which is mixed with 75% gold and other metals, showing a white color on the surface. Therefore, white K gold will fade and turn yellow after being worn for a long time.

The most direct way to identify platinum is to look for the unique platinum mark in the jewelry - Pt or platinum. According to national regulations, the back of each piece of platinum jewelry must be engraved with platinum's exclusive mark: Pt or platinum (platinum), and after the mark, it must also indicate the purity of platinum, which is the thousandth of the platinum content, such as platinum ( Platinum) or Pt950, Pt990, Pt999, the latter two are commonly known as pure platinum and thousand-foot platinum.

It is like a platinum ID card. Only jewelry marked with platinum's exclusive mark - Pt or platinum is real platinum jewelry. The mark of white K gold is Au750/G750/18K/Gold 750, which means that its 75% alloy material is gold, and after adding other metals, it will appear white on the surface.

Baidu Encyclopedia-Platinum