The piece comes from New York-based Catbird.
She's engaged to Colin Jost of Saturday Night Live fame.
It appears to be an elongated cushion cut.
One jewelry pro rates the 3- to 4-carat diamond ring as "surprisingly modest.”
It's one of the most expensive celebrity engagement rings ever.
The look has 'been on a stratospheric rise.'
It has a 'huge circular gemstone.'
Quite a lot of bling.
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