Michelle also wore the ring while spending time with her BFF Busy Phillips at Sunday's Golden Globes and at the LA premiere of All the Money in the World in December.
When asked about if it was an engagement ring, Williams told People it was "beautiful jewellery" without clarifying her relationship status. The heart-shaped diamond is bezel-set onto a yellow-gold band, and is simply divine:
The actress has not confirmed everyone's suspicions that this is an engagement ring, but it sure looks like one.
This article originally appeared on InStyle.