That is one GIANT rock!

Ciara had a blast flashing her reported 16-carat engagement ring from fiancé Russell Wilson on Saturday while celebrating the opening of Marquee Nightclub and Dayclub in Las Vegas.

RELATED: Ciara's Ex-Fiancé Future Hits Strip Club After News of Her Engagement to Russell Wilson

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This is the first closeup we've seen of the bling, apart from the quick glimpse the 30-year-old gave fans in a video posted after the proposal.

Curious to see how this stunner stacks up to her previous ring from ex-fiancé Future? Scroll down to compare more of your favorite stars' multiple engagement rings!