Spinel was already a short distance away from the group by the time Bloodstone had shown himself, but she would have needed some serious hearing issues in order to not hear and take note of what he just said.  Spinel had a decision to make, trust this guy or keep moving?  Learning about herself and her powers piqued her interest slightly... didn't it?  Up until this point she'd basically just been going where she was led, she'd given no real thought to her future or what she actually [i]wanted.[/i]  She slowed down a little and thought some more.  She needed more evidence, but was it worth it to ask him herself?  

Spinel scanned the area and noticed a rather nice dumpster that had been flipped on its side.  It would provide next to no cover but would get her out of sight long enough for her to turn invisible and listen in on whatever was being said.  She'd have her information [i]and[/i] get it from relative safety, assuming the others asked the questions she assumed they would.  She realized she'd be accomplishing basically nothing by doing this if they finished talking and she still had questions of her own, but she'd cross that bridge when she came to it.

Spinel casually walked behind the flipped-over dumpster and didn't walk back out.  At least, not as far as anyone who may have been watching was concerned.  In reality, she was now standing about 20 feet away from it.  Just close enough to still be in earshot, far enough away that she could hide behind it again before her invisibility ran out, so as not to give away her ace in the hole to this gem and human she'd never met.  ...It occurred to her that she probably should have used it far more sparingly around her current companions, but there was no use in dwelling on the past.