That’s no paper ring.

Taylor Swift and Travis Kelce jointly announced their engagement on Instagram Tuesday, sharing photos of their romantic garden proposal — along with a close-up of the superstar’s stunning diamond ring.

Her old mine brilliant-cut sparkler was co-designed by Kindred Lubeck of Artifex Fine Jewelry and Kelce himself, Page Six Style can exclusively confirm.

Taylor Swift showed off her brand-new engagement ring from Travis Kelce on Instagram Tuesday.

Her old mine brilliant-cut sparkler was co-designed by Kindred Lubeck of Artifex Fine Jewelry and Kelce.

Both stars wore Polo Ralph Lauren for the proposal.

Hand-cut and characterized by their cushion-like shape, rounded corners and chunky facets, old mine cut diamonds were especially popular in the 18th and 19th centuries; no two are alike.

“I am a goldsmith specializing in hand engraving (think of it as tattooing rings – a lot of people confuse engraving with ‘etching’),” Florida native Lubeck told Voyage Jacksonville in 2024.

“Basically, I take very small, sharp instruments and cut away bits of metal, usually on the sides of rings, into a particular design.”

Lubeck’s rings for Artifex Fine range in price from $4,300 for a signet style with a North Star motif to $38,000 for a 5.02-carat old mine cognac diamond design.

“Your English teacher and your gym teacher are getting married,” Swift and Kelce captioned their post.

For the magical moment, the 14-time Grammy winner wore a striped silk Polo Ralph Lauren dress and cognac-colored Louis Vuitton sandals.

She accessorized with her diamond-studded Cartier Santos Demoiselle watch and her “TNT” friendship bracelet by Wove, the latter a Christmas gift from Kelce.

“Your English teacher and your gym teacher are getting married,” the pair captioned their post.

Swift and Kelce began dating in the summer of 2023.

The Kansas City Chiefs tight end coordinated with his partner of two years in a navy Polo Ralph Lauren knit.

Swift and Kelce began dating in the summer of 2023, shortly after the football pro famously tried (and failed) to pass the pop icon his phone number at one of her Eras Tour stops in Kansas City.

They’ve been practically inseparable ever since, with Swift supporting Kelce at many of his games (and two Super Bowls!) and Kelce attending the Eras Tour in multiple countries — and even making an onstage cameo in London.