The hip-hop power couple shared photos and videos of Cardi nearly crying after laying her eyes on the heart-shaped ring, which the Migos rapper described as the "Titanic Diamond."
"HAPPY BIRTHDAY TO MY QUEEN U DESERVE EVERYTHING THAT COME YOUR WAY I LOVE YOU AND OUR FAMILY TOGETHER," Offset captioned an Instagram video of himself placing the ring on Cardi's finger.
Cardi also shared a video of herself unveiling the gift, and gave a shout-out to the New York-based jewelry company that designed the ring.
"Thank you sooo much babe @offsetyrn I can’t believe it --Deum @pristine_jewelers ! I’m so happy," Cardi captioned the clip. "Soo grateful."
In addition to showing off the ring, Offset took to Instagram to share a sweet, PDA-filled birthday message.
"MY BEST FRIEND THE LOVE OF MY LIFE, MY GUARDIAN ANGEL, KK’s MOM, THIS DAY IS YOUR SPECIAL DAY I LOVE YOU, HAPPY BDAY!!NOT JUST ME AND FAMILY BUT THE WORLD LOVES YOU," he wrote alongside a video montage of the couple making out in a number of scenarios as Alicia Keys "Unthinkable" collab with Drake plays over the clip.
Cardi commented in the post, “I love you babe thank you for everything."
The two recently celebrated their second marriage anniversary and share 1-year-old daughter, Kulture.