Your mom probably likes rings. But she does not want anything as a ring. She wants gold or diamond rings. Gold is yellow metal. The diamond is a transparent stone, a crystal in fact. At first these two elements were rare.
Now we can produce diamonds compressing stones. Also those who own gold have a lot of money. Now, it is the gold rings that are more valuable than the rings with a diamond without gold. Traffickers use this desire to own to raise prices. Thus gold is worth more and more (...)