@pastanaga - Actually they might not be as expensive as you think, depending on what kind of color you want.
I've seen black ones priced for around a hundred dollars. Of course that's without being set in jewelry. A blue or white star sapphire or a pink star sapphire are usually more expensive and get into the thousands of dollars.
The really deep blue ones are the most expensive, although if you see a twelve pointed star (these are more rare than the six pointed star) that usually puts the price up by quite a lot.
I really want to start making star sapphire rings so I've been paying attention to the prices. I think they are well within reach of most ordinary people myself.