The princess, who is eighth in line of succession to the British throne, will marry Brooksbank this autumn at George's Chapel in Windsor.
Eugenie, 27, was pictured just a day after she announced her engagement to former barman Jack, 31, on Monday. "Brooksbank became engaged in Nicaragua earlier this month", Reuters reported.
Fergie told followers the engagement was "total joy", while writing an extended statement over the image, saying: "Total embrace of gooness's and joy". "I was over the moon ..." What sets a padparadscha sapphire apart from a traditional sapphire is that the gem is a mixture of red and yellow sapphires, which creatures the lovely rosy hue you see below in Princess Eugenie's ring.
The couple, who were introduced through friends during a ski trip in 2010, will Wednesday in the fall at St George's Chapel in Windsor, the same venue where Harry and Megs will tie the knot.
Eugenie's mother, Sarah Ferguson, tweeted a personal note along with the news: "I always say that the river flows well to it's [sic] destiny because of the guidance of a solid rock".
On the engagement ring, Jack said: "I went and found an fantastic padparadscha sapphire but then didn't want to do anything until Eugenie had signed off on it". "I actually said "this is an incredible moment", and then he popped the question", the princess gushed.
Eugenie said: "We met when I was 20 and Jack was 24 and fell in love".
The princess works in the arts as a director at gallery Hauser and Wirth.
Brooksbank has been working as a brand ambassador for Casamigos tequila's expansion into Britain and Europe.