The singer flashed the sparkler during an appearance on The Tonight Show with Jimmy Fallon on Wednesday night and admitted she picked it out.
The 32-year-old newlywed, who only confirmed that she married the actor last week, proudly held up her left hand as cameras zoomed in on the dazzling emerald ring along with her gold wedding band.
She gushed to host Fallon: "It’s my first time showing my ring.
I feel like you’re part of my relationship because we watch you every night – is that creepy?"
Asked if she helped her husband in picking out the gem, she joked: “I may have guided him in the right direction..."
“It’s when you know what you want," she continued.
“I knew I wanted to be with him and you want it to be really right so I may have taken him to the shop and pointed out exactly what ring I wanted!"
Ora, who did the interview in a silver crop top and mini skirt, also revealed that her new married life inspired her upcoming album.
“I’m so excited about this album because I feel like the journey it took me to get to this point, the past two years, my life has changed so drastically,” she said.
“Making a decision to spend the rest of your life with someone is kind of a big decision and so it got me writing again.
“I got inspired by love, even if it’s cheesy... This is more than just music, it’s a moment in life for me."
Her new song, You Only Love Me, opens with a voice memo for Waititi and the video depicts a fictional wedding “through the lens of a Stepford Wives-meets-Alice In Wonderland-style narrative”.
There are also cameos by Kristen Stewart, Lindsay Lohan, Jodie Turner-Smith, Chelsea Handler, Addison Rae, Alexander Stewart and fairy godmother Sharon Stone.
During a performance of the song on Fallon, she wore a pink lace bodice babydoll dress paired with lace gloves, fluorescent stockings and metallic platform heels.