Liam Hemsworth popped the question to Miley Cyrus -- and now we're getting a look at the rock he gave her when he proposed!

The 22-year-old "Hunger Games" star wasn't messing around, approaching famed celeb jeweler Neil Lane to create the sparkler.

According to PEOPLE, Hemsworth wanted "something unusual" for his 19-year-old fiancee ... and it sounds like he got his wish.

The 3.5-carat cushion-cut diamond ring reportedly has a center stone cut way back in the 19th century.

As for Miley, she's clearly happy to be engaged and a big fan the ring -- tweeting earlier today, "thank you for all the love today :) I'm happy to share this news with you all. I feel like all my dreams are coming true. ❤ have a great day."

Miley's dad, Billy Ray Cyrus, tweeted his excitement as well, writing "All I ever hoped for as a Daddy was to see my kids reach their dreams. To find happiness...peace of mind ...and someday know... true love."

See how Miley's rock stacks up against other engagement rings in the gallery above.

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