All the details on the singer's 15-carat sparkler from Future.

Courtesy Avianne & Co.

Kim Kardashian isn’t the only one with a huge engagement ring weighing down her left hand. Ciara is now a member of the 15-carat club.

Rapper-producer Future proposed to the singer over the weekend with one impressive custom rock that he helped design with the jewelers of Avianne & Co. The sparkler, officially named “Past Present and Future Emerald Cut Diamond Ring,” features 15 carats of emerald diamonds on an eternity style band with … you guessed it … more diamonds all the way around! The cost? Just over half a million, according to the jewelry retailer.

“The ring is a very intricate design which took longer to actually design than it did to produce,” a rep for Avianne & Co. tells PEOPLE. “We went through several molds and concept models before landing on the proper design, which allowed for maximum shine and stability in the diamonds. This vision of blending ring styles together allowed for a very unique ring.”

Also like Kardashian, Ciara’s engagement was a birthday surprise!

“Today Has 2 Be Like One Of The Sweetest Days Of My Life! #TheBestBirthdayEver,” Ciara Tweeted Sunday. “If I’m Dreaming I Don’t Want To Wake Up..Aaaaaahhh!!!:)”

Now we can’t wait to see her dress. What do you think of Ciara’s new bling? Do you like the unique design? Share your thoughts in the comments.

–Brittany Talarico