A couple of months ago, Janga talked about grand gestures in her blog, So Romantic: Favorite Grand Gestures in Romance Fiction where she stated:
First, it must be something that is inextricably linked to the particular hero and heroine and their story. Then, it must be costly. The cost does not have to be monetary; it may be costly in terms of time or effort or emotional risk. But whatever the currency, the gesture must be a gift given without measure. Finally, the truly grand romantic gesture must reveal the hero’s understanding of the heroine and who she is, what her dreams are, and what her vulnerabilities are.
There is certainly an association between the grand gestures, and the sweetest, but for the most part grand gestures are planned out, and many times cost a lot of Benjamins, like a trip to Paris, or that large diamond ring, or maybe skywriting words of love.