Carrie Underwood Wears 48ct Valentine's Day Necklace Designed By Husband To Grammys

The jewelry also featured a dangling vivid yellow solitaire diamond that weighed in at an eye-watering estimated 12 carats alone and matched the canary yellow diamond ring Carrie's husband popped the question with in December 2009.

The centerpiece diamond was so precious that Arndt even opted to name the stone "The Firefly Diamond," after the line "I love the way you look in a firefly glow" in Underwood's latest hit, "Heartbeat," which she performed with rising country star Sam Hunt during the ceremony.

The entire piece was also named after Carrie's newest single, taken from her 2015 album Storyteller, as Underwood's jeweler revealed in a statement that the necklace was named "The Heartbeat Ruby Necklace with the Firefly Yellow Diamond."

The jewelry house has not officially revealed the exact price of the stunning accessory, though it has been described as "a priceless necklace that commemorates love." However, it's estimated that the accessory could be worth upwards of $3 million.

"It's mine to wear, so whenever I feel like it, I can be in my sweat pants, making dinner, wearing my necklace," Carrie told Entertainment Tonight of her gift on the Grammy red carpet. "I kind of knew it was coming. We had been helping and working with designer Jonathan Art to make something special," Underwood revealed. "We don't do a whole lot of gifts often, it was nice. This is many years' worth of gifts."

But this certainly isn't the first time Carrie Underwood has worn millions of dollars' worth of precious stones around her neck at the Grammy Awards.

People Style Watch revealed at the time that Carrie's 2013 necklace weighed an estimated 381 carats and featured a slew of precious gems including oval, pear, marquise and round brilliant white diamonds.

"It's heavy on my soul," Carrie Underwood joked to E! News of piece at the time. "I'm afraid someone is going to tackle me and steal it… It's worth more than me!" she joked.

But, it's not just on the red carpet where Carrie Underwood rocks some seriously pricey Jonathan Arndt jewels.

According to Us Weekly, Underwood is used to rocking some serious bling when it comes to her jewelry as the site is claiming that Carrie's canary yellow diamond engagement ring is worth an estimated $800,000 and was also created by Johnathon, alongside Mike Fisher, specifically for Carrie.

Speaking to E! News about Underwood's engagement ring in 2009, Arndt revealed that the "ring is a symbol of love from Mike Fisher to Carrie Underwood."

Carrie opened up about the proposal during an appearance on VH1's Behind The Music in 2012, where she joked that she actually forgot about the ring during the romantic moment.

"It was just a really sweet moment. He said my full name, 'Carrie Marie Underwood, will you marry me?" Carrie recalled on the VH1 series, "[Mike] got down on his knee, like every man should. And I tackled him in the snow. I forgot to even look at the ring, like, I wasn't even paying attention!"

What do you think of Carrie Underwood's 48 carat necklace?

[Photo by Jason Merritt/Getty Images for NARAS]