Emerald Stones.

This one rocks belong to the type of rock gems and high-priced for its class.

This gemstone has light green to dark green. Emerald stones including silicate mineral beryl and green color is caused by traces of chromium. Emerald including high hardness (7.5 on a scale Mohr)

Producing high quality emerald is Colombia, Siberia, Africa, Zimbabwe, Australia and Brazil.

I have a collection of emerald green color and the inside looks like honeycomb. And will look brighter when exposed to sunlight.