11-Carat Diamond debuts on Scarlett Johansson's hand

For those who did not know, Scarlett Johansson is engaged to Colin Jost. Actually she got engaged in May, but Scarlett only recently debuted her, take a deep breath… 11-carat diamond engagement ring!

Page Six reports the ring is believed to be by Taffin's James de Givenchy who is the nephew of the Givenchy design house's late founder Hubert de Givenchy.

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The "Brick".

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Rare Carat's gemologists and data scientists, meanwhile, told ELLE.com that they estimate the ring would retail for $450,000. "The diamond has great clarity which is hard to find in a large fancy colored diamond, especially a light brown," Rare Carat explained. "The cutting style is different to the norm, too. It is cut as an 'old cut,' which is an antique style of cutting. You will notice an angular pear shape in the middle—that is an open culet which is how they used to cut diamonds before modern cutting methods were developed. The open culet means the base is flat, not pointy. If it is indeed a Type IIA diamond, it has the rarest chemical structure type for a diamond and the most coveted. This type has no nitrogen impurities. Famous large diamonds, like the Cullinan and Koh-i-Noor were also Type IIA."