An Ordinary Miraculous Stone

(Comes at max level)

Valentine's Chocolate from Arjuna (Alter).

Increase Kira Kira Point drops by 10%. [Valentine 2022 Only]

Gives 30,000 CE XP when used as Experience fodder for other Craft Essences.

A return gift from Arjuna (Alter).

It has neither value as an object of magecraft or a piece of art. Rather, it has merely been polished to be beautiful. It's really up to you to determine its value.
Is it an insignificant imitation jewel?
Or is it a treasured gift from a special friend?

As long as it remains beautiful, it doesn't matter what value others may assign to it.