"Your girlfriend doesn't want heart-shaped jewellery, I promise you," US woman Clare tweeted.
"If you read this and still think she wants something heart-shaped, I am willing to help you find something that isn’t ugly.
"This is my act of service to my fellow women."
While originally posted last December, the post has resurfaced and racked up over 400,000 likes, with people debating the claim.
Thousands of women commented in an agreement calling heart-shaped jewellery "tacky" and "childish".
"Thank you for your service," one woman wrote.
