The singer-actress says her ring was getting repaired so she could not wear it.
She had fuelled break-up rumours after being spotted without the ring on several occasions while her fiance Hemsworth is in Australia.
Lindsey J Lee, a Miley backup singer, tweeted, "had to send off my engagement ring today to get fixed... One of the little diamonds fell out...".
Miley responded to Lee, "Ugh that's the worst! I just had a similar situation except when it happens to me then everyone says my wedding is off."
Miley was forced to take to twitter to clarify that her wedding with the actor was not off but that did not stop the rumour mills as the couple have been seen together rarely in recent times.
Hemsworth is in Australia while the singer was spotted partying in LA.