>>54504772>>54504794The terastal state is represented by two symbols: the 6-pointed star, and the angry jewel. However, Ogerpon's special terastal states only use the 6-point star, with no angry jewel (picrel)
What this suggests to me is that, intentionally or not, something about the Tera Orb is responsible for the angry jewel being present on all the tera jewels, as the pure crystals don't seem to cause this phenomenon. Of course this doesn't explain why wild tera mons also possess the angry jewel, but something in Paldea has altered the terastal phenomenon