Hey there! Did you notice that Lapis didn't have a star motif on her anywhere? Instead she had a diamond, which could be seen AS a star, just not a five pointed one. Do you think other Gems could possibly carry different star-esk shapes depending on what group they stand with/side they are on?
I did not even think to look at that upon my first viewing of the episodes last night I was just SO EXCITED about everything. But you are correct, there is no star design anywhere on Lapis which is really interesting since she is the first outside gem to be identified!
Thinking about it now, between the Crystal Gems there are ‘five’ gems in total, so maybe that’s where the star design comes in, it could specifically be their symbol for what the Crystal Gems stand for.
As for the diamond (or maybe triangle?) on Lapis, it could totally be a rival symbol! It actually reminds me a bit of the symbol on the rival figure we saw in “Serious Steven”, although it’s not pointed quite the same (not that it means much, the stars on the Gem’s are all different)