Themes
Six a shop may choose. Each carries two values no formula can pick.
Green
.ceo default
Sapphire
3 shops
Ruby
1 shop
Fire Opal
unused
The one that proves the rule — it takes dark ink where every other theme takes white.
Amethyst
unused
Teal
unused
Why there is no colour picker here
Two values in every theme cannot be derived from the accent: the ink that sits on the fill, and the soft variant on a light ground. Fire Opal fails at 3.40 where Sapphire passes at 7.00 — and no formula picks correctly between them.
So the shape is
A gem, plus two measured overrides, checked on both grounds before it is ever offered. Adding a seventh theme is a measurement, not a setting — which is why it happens here and not in a shop's own settings.