2017-04-23
Diamond:

The only gemstone composed of one pure element, carbon, whose molecules are bonded with perfect symmetry in every direction. This perfect atomic structure is what makes it the hardest...

Read more

Valdemar Brekhov 5

2016-10-17
Topaz:

Topaz is a silicate mineral of aluminium and fluorine.
The name "topaz" is usually derived from the Greek Τοπάζιος...

Read more

a-test a-test 0