This emoji is used to represent playing cards, textual decoration, and a jewel. This symbol is mostly used by young girls to make their conversion more decorative. It has neither a negative nor positive connotation.
NOTE: Small Blue Diamond was accepted in 2010 as part of Unicode 6.0 and in 2015 labeled as Emoji 1.0.
🔹 Small Blue Diamond
:small_blue_diamond: (Github, Slack)