The jewel indicates someone's feelings, usually towards Ryu. If it's black or dark purple, the entity in question doesn't just hate your guts, it wants to pull them out of you. From there, it shifts to red (still hates you) to orange (ambivalent) to yellow (starting to like you) to green (likes you) to blue (really likes you) to flashing (loves you, believes you're the second coming, really, really, really likes you, would die for you, or any combination of those).

Story scenes can raise or lower the jewel level, but it always goes up when the character in question gains a level. It really doesn't matter, with the exception of a Township resident named Barbose.

Look at Ben Siron's manual if you want more detail.

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