Emerald,

variety of the silicate mineral beryl. His color is green by the addition of chromium and vanadium ions. Emerald is valued as a gemstone since time immemorial.

Quartz,

second most common mineral of the earth's crust. Pure it is completely transparent and colorless and is called "rock crystal". Due to the inclusion of colored minerals or other causes, quartz can be colored differently. Yellow to orange brown quartz is called "citrine", violet as "amethyst", pink as "rose quartz", etc.