I don't want to venture too far into spoiler territory as I'm also one of those not caught up yet but i will theorise/ponder about future episodes
Let's start with the gem only just finally seen properly for the first time at the end of the episode “legs from here to homeworld” (S05E25) that is of course the elusive and aloof white diamond.
At the same time she's calm and distant distinctly separate from the world.
but shes pretty pivotal to the entire series being not just 1 but 2 other important characters in the series.
Pink diamond, took on the persona of Rose quartz who became, through as of yet unknown gem magics with Greg universe's help/input, Steven universe.
She is seemingly youngest and most childlike of the diamonds and is treated as such by the other diamonds in the great diamond authority.
But pink diamond is deeply curious always looking for the excitement of the new.
Pink diamond is a stone that is good at amplifying creative energies particularly when it comes to visualisation and manifestation of goals and dreams.
As always Ive been Roo you've been awesome and this has been #readingsbyroo
Stay safe folks 💜