"Be Bold wear Gold"

You are so popular gold
Thats why you're easily sold
Your yellow, shiny surface is bright and bold
You come from ancient times, but you never get old

In other countries I use you to buy things
And even to make dental fillings
Commonly purchased by many kings
You can be obtained through mining's

196.9 is your total mass
And you're definitely a solid not a gas
Your atomic number of 79 is not last
Because you are considered of high class

Although you're discoverer is not known
You've been around since the making of tombstones
Your value has always been shown
And you will forever be owned