Gray ring (Transformer)

Appearance: Often associated with a minimalist, industrial, or contemporary style. Depending on the material, it can have polished, matte, or faceted finishes.

What is it? A "grey ring that goes on the finger" can mainly refer to two different things: a piece of jewelry made of a modern material of that color, or a greyish/black stain that a ring leaves on the skin.

And as you can see, it's a magical object, a ring that can be worn on your finger, that transforms you into any woman or furry and more. It's an inanimate object that has no life of its own; it's just a magical object, so it's a simple magical object.

the shapes you can take with the ring:
Raven (young teenager) with pale gray skin, short violet hair and eyes of the same color

Toriel: an anthropomorphic boss monster with the appearance of a white goat, floppy ears, small horns, and eyes with dark red irises.

Amy Rose: is an anthropomorphic hedgehog with pink fur, green eyes and peach-colored skin on her snout and arms.