Kate Hogan
August 23, 2012 02:30 PM

Rob Dipple; Inset: XIVKARATS

When it comes to Avril Lavigne‘s engagement ring, it’s not so complicated — it’s huge!

Her new fiancé, Nickelback singer/guitarist Chad Kroeger, 37, chose a stunning sparkler for his Aug. 8 proposal.

“We helped Chad custom create Avril’s dream ring: a platinum-set pear-shape diamond with half moons totaling 14 carats from XIVKARATS in Beverly Hills,” designer Caryn Alpert tells PEOPLE exclusively. “What a perfect pair/pear!”

The bride-to-be, 27, “is glowing,” a family source tells PEOPLE. Adds a friend: “Just looking at them, you can see how much he adores her.”

–Marisa Laudadio

SEE MORE SERIOUSLY HUGE STAR ENGAGEMENT RINGS!

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