Many minerals form beautiful crystals, but the most prized of all are gemstones. Uncut gems often look fairly ordinary–like rocks. It's only when they are cut and polished that they obtain the ...

The tunnels will lead you to blue rocks. Hit the rocks with a pickaxe, giving you tons of Blue Gem. For the Red and Green Gems, head to 27.0 Latitude and 41.2 Longitude and dive into the water.

Researchers at Heidelberg University are studying the formation of this characteristically blue-colored crystal in volcanic melts Sapphires are among the most precious gems, yet they consist ...