Breaking a rating board gave me an Amethyst, worth 20 gems.
The question is, what are the types of dropped gems and where do they come from? Most blocks I break only give gems/jewels (1 or 5 gems worth), but this is the only one I came across that gives amethysts.
Also, I’ve seen emeralds for 50 gems and rubies for 100 gems, but what blocks do these drop from?

You can find all of this information on the gems page of the Pixel Worlds Wiki, I’ve linked the page below for you.