Now that’s a rock.

Post Malone proposed to girlfriend Christy Lee with a mammoth engagement ring that could probably be seen from space.

“When I saw this ring, I audibly gasped,” The Clear Cut founder and CEO Olivia Landau told Page Six Style of the solitaire-style sparkler.

“It looks like a beautiful oval diamond, probably around anywhere from 10 to 15 carats.”

Landau places the jaw-dropping ring’s price tag at between $1 and $2 million — and

Katie Zimmerman, SVP of merchandising at Jared Jewelers and Diamonds Direct, agrees with that estimate, adding that the center stone could be as large as 17 carats.

“The diamond appears to have a distinctive…

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