Britney Spears's $70,000 engagement ring features four-carat diamond and special engraving

The ring was designed by Sam Asghari with Forever Diamonds NY, and is now part of the brand's collection

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A delighted Britney Spears announced her engagement to Iran-born fitness expert Sam Asghari on Sunday.

Showing off her sparkling new ring, the singer captioned an Instagram video, "I can't believe it," with a series of diamond ring emojis.

Now, details about the bespoke piece of jewellery have been revealed by the designer, Roman Malayev at Forever Diamonds NY.

The ring is estimated to have cost $70,000 and has the word "lioness" engraved inside, which is Asghari's nickname for his new fiancee.

"Our team couldn’t be more thrilled to congratulate Britney Spears and Sam Asghari on the beginning of their forever," a post on the Forever Diamonds NY Instagram account reads.

"The thought and detail Sam put into this ring made the design process so special for Roman [Malayev] and our team. In honour of the lioness herself, we are naming this gorgeous setting The Britney. Sam and Britney, we wish you a lifetime of happiness together."

The Britney ring is now a permanent part of the Forever Diamonds NY collection. It features a four-carat round brilliant stone in a platinum cathedral setting, with pave detailing on the bridge and flush-set diamonds on the prongs and basket.

Get a closer look at Britney Spears's Forever Diamonds NY engagement ring here:

Jeweller Mehul Pethani from Cara Jewellers in Dubai says this is currently a very popular style of engagement ring. In Dubai, four-carat diamonds "start at Dh100,000 ($27,200)", with the price increasing up to Dh1 million "depending on quality", he adds.

Spears and Asghari announced their engagement on Sunday, after five years together.

They met in 2016 on the set of the singer's Slumber Party video. Asghari plays the singer's love interest in the music video set in an old mansion being used as a nightclub.

The singer is currently fighting a legal battle to end the 13-year conservatorship that controls her personal life and finances.

In the past, Asghari has said he is looking forward to a "normal, amazing future" with the singer. In June, Spears spoke in court, revealing that the conservatorship terms prevent her from having any more children or getting remarried.

She has been married twice, first to childhood friend Jason Alexander in January 2004, but the Las Vegas marriage was annulled after 55 hours.

She then married Kevin Federline in September 2004. The couple divorced in July 2007 and have two sons: Sean Preston, 15, and Jayden James, 14.

Updated: September 13, 2021, 12:46 PM