Jewelry culture
Alloys: what is their function?
Gold: why is it a precious metal?
The 4C rule is used to determine the price of a diamond based on a ratio: Cut, Color, Clarity and Carat.
Palladium is one of the most precious metals, along with Rhodium, Platinum and Gold.
How to recognize gold using acids?
Recognizing gold using acids
Platinum is a rare, precious metal, like gold and silver, non-magnetic, pure, good conductor of heat and electricity.
A precious metal is a chemical element metallic rare and of great economic value.
Chakras and stones