Fast-bowler Brunt, 34, and all-rounder Sciver, 27, became a couple after winning the World Cup final against India in July 2017.
Brunt then popped the question on New Year's Eve last year.
The cricketers shared the news of their engagement in The Guardian on National Coming Out Day.
'We knew it was right': cricketers Nat Sciver and Katherine Brunt get engaged | I/V by @collinsadam https://t.co/x2ukMUTc57
— Guardian sport (@guardian_sport) October 11, 2019
Brunt said they decided to delay the news because of her parents' Christian values.
She said: "My parents are different to Natalie's.
"They are quite Christian so it is not something that is done and that is why it has held me back.
