A glyph that is used for kawaii in Japan, resembling the shape of a flower.
Google's design previously resembled a flower, while Samsung's previously displayed a white symbol on a blue square.
Diamond with a Dot was approved as part of Unicode 6.0 in 2010 under the name “Diamond Shape with a Dot Inside” and added to Emoji 1.0 in 2015.
U+1F4A0
? Diamond shape with a dot inside