my guess is you aren't a high enough level yet, a lot of these features don't become active until around lvl 100. When you reach the appropriate TC level, you will unlock an icon in the top of the screen that says Gems.
Flygia is a similar situation, a building will appear behind the textile mill when you reach the required level (called the flygia pavilion)
The link has pertinent information for people new to the game, but I don't see how it helps the more seasoned players. Perhaps dovo should do an article for people who have been playing this game for a few years but still have questions about high level issues such as God General and glyphing and so on. That would be nice.
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