What do the Gemstone of each Diamond look like?
What color is their Diamond Essence? What does it do? [Example: In canon - White's Essence/Power effects the Mind, Yellow's effects the Physical Form, Blue's effects the Emotional State, and Pink's manipulates Energy/Life Force itself.]
Hiya thanks for asking! firstly my seasonal diamonds are lesser/less powerful than the diamond authority and exist in the same universe (granted VERY far away)
My work in progress lore for them is that after pink's "shattering" white diamond made the seasonal diamonds as a back up/fail safe.
From left to right and top to bottom we have Winter diamond, ever lasting day Corundum, Summer diamond, Fall diamond, Eternal night corundum and spring diamond.
The corundum's (the second hardest type of gem irl) are there to keep an eye on the seasonal diamonds on behalf of white.
Winter and Summer's gem's are on there stomach (same as pink) and Spring and Fall's on the small of their backs
The corundum's gem's are on their chests
i think the diamonds kinda reflect life states
Spring: birth
summer: thriving
fall: dying/struggling/decaying
winter: death
Thanks for the ask!!