<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
What types of gems are the most expensive?
<|assistant|>
The most expensive gems are usually colorless diamonds, with pinks and reds, yellows and oranges, blues and greens being the most sought after and expensive shades. Other expensive gems include emeralds, rubies, sapphires, aquamarines, and tanzanites.