Were are the sand glasses in Pokemon emerald?

There are no "sand glasses" in Pokemon Emerald. It sounds like you might be thinking of a different item, perhaps:

* Sandstorm: This is a weather condition that can occur in battle and gives a boost to Rock and Steel types.

* Sand Stream: This is an ability that some Pokemon have which automatically starts a sandstorm when the Pokemon enters battle.

* Sand Attack: This is a move that lowers the opponent's accuracy.

It's possible you are thinking of a completely different item, but if you can provide more details, I can help you find what you're looking for!