[Spunky]

"Appears to be a sapphire.

Could be, but the sapphire looks like light can shine through it and the stone in Arnolds ring looks dense

Also I don't think you would ever see a sapphire cut like the stone in Arnolds ring.

SAPPHIRE

[Lucy Lake]

This stone looks like a blue star sapphire, when cut with a convex surface, and polished, exhibits a star shaped figure due to crystals by reflected light.