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Today I'm going to introduce about of platinum precious metal.
All the world's gold and platinum are came from outer space after a mammoth meteorite shower battered the Earth more than four billion years ago, scientists revealed.
Platinum is a rare precious metal primarily used to create fine jewelry.
Its heavy weight and durability make platinum a metal that will not wear away with constant use like gold.
Platinum holds fine gemstones firmly in place for the life of the jewelry when used for prongs and other setting components.
What is platinum?
South Africa and Russia are often said the largest country of origin of platinum, although the geological conditions are very different from these countries.
But Platinum is also found in Japan platinum is a naturally occurring white metal.
It is rarer than gold, and much heavier and harder.
Because of its hardness, platinum can be used in a purer form than gold.
Usually at about 95% new platinum jewelry is consequently more expensive than new gold jewelry.
Mainly in Hokkaido, from the sand of rivers such as Kitami, Teshio, Ishikari it seems that it was collected by the bowl method.
Platinum powder found diameter is 6mm, heaviness is 0.64g It seems that commercialization for mining was planned for a while.
Sand platinum has been found not only in Hokkaido also found in Niigata prefecture.
The most common platinum alloy is platinum 900 (Pt900) typical alloy of 90% platinum with it is added alloy10% palladium.
Platinum is softer than gold because it is easy to design most of the rings, brooches are made of platinum 900.
Merit of platinum
Platinum is one of the rarest and most durable precious metals.
Platinum's rich, white luster enhances the brilliance and will maintain its shining luminosity forever, unlike other white metals which can, in time, turn yellow or tarnish.
The amount of mining is about 1/20 a year of that of gold, it is a highly rare precious metal.
Platinum is not white gold !
Not everybody knows it, but white gold doesn’t exist naturally.
It’s made from yellow gold mixed with white metal alloys like palladium or silver.
Afterwards, it’s given a beautiful coating with a rare, silvery-white metal called rhodium.
This final rhodium finish gives white gold its luminous sheen.
White gold mark is such as 
Platinum marks
Platinum content is usually expressed as the amount of pure platinum the jewelry contains in parts per thousand.
Here are some important platinum facts regarding content markings :
Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum".
Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Pt" if a number is used in front of the term to disclose the amount of pure platinum in the mix, such as :"Pt850", "Pt950" , "Pt1000"
Why platinum is expensive?
The characteristics of platinum include "high durability and heat resistance" and "difficulty in deterioration".
Due to these excellent properties, platinum is recognized as a precious metal that is in high demand not only in Japan also worldwide.
As a result demand continues to outpace supply, which is why platinum is so expensive.
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