Lol 

Beryl makes the sandwiches for half time.

Use it for yielding and plundering. Don't listen to Wikipedia.

Well-known varieties of beryl include emerald and aquamarine. Aquamarine is a blue or cyan variety of beryl. Emerald is green beryl. Morganite, also known as "pink beryl", "rose beryl" "pink emerald".

When you send  troops to a tile the beryl gems increases troops capacity so you can send less troops to tiles during evens reducing casualties and  in between events you can empty a whole tile with less troops because of the increased capacity, Also when you hit a town you troops will be able to take more rss in one hit with their increased capacity.