Congo or Brazilian Citrine - what's the difference?

At jujujems.com, we have two categories that can be a bit confusing—Specimens and Rough Rock. Both categories are closely related, and although we may put an item in both categories now and then, they are not the same thing. In this blog, we'll do our best to explain the differences between the two and answer the questions:

Introducing gorgeous Tiffany Stone! This one-of-a-kind rock is also known as "Bertrandite," "Ice Cream Opal," or "Opalized Fluorite." Here's some interesting info about it:

What’s the big deal about rocks? Aren’t crystals woo-woo things? Why should I care about them? What are they good for? This is evil stuff!