Platinum, sapphire and diamond ring - certificate

Platinum : Platinum is the most precious metal on earth. unlike gold that is too soft to be used whithout being alloyed with 25% of other metals, platine can be used 95% pure. It extremely white color is appreciated for setting extremely pure diamonds.
Color : White diamonds color range from D (colorless, the purest white) to Z (light color). D, E and F are colorless diamonds, G, H , I and J are near colorless , K and L are faint color, M to Z have a light color.
Sapphire : Sapphire is a gemstone of the family of the mineral corundum. The most famous color for Sapphire is blue, but trace amounts of other elements can give yellow, purple, orange, or greenish sapphires. In the case of chromium impurities in corundum it would be called a called a Ruby. Sapphires are found in Sri Lanka, Myanmar or Australia.