This story is a sequel to A Fact for Twilight
Applejack's mother was a Manehattan pony who fell in love with Sweet Apple Acres and the farmer who lived there. The gold necklace he gave her wasn't expensive or flashy, but she loved it anyway. Now that Applejack is ready to propose to Twilight with the same necklace, she hopes it really is fit for a princess.
(Cover art base by Sketchy Jackie. This is a stand alone sequel, you don't have to have read A Fact for Twilight.)