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It's not implementation defined, i's defined by the Emoji_Presentation property in https://www.unicode.org/Public/13.0.0/ucd/emoji/emoji-data.txt https://www.un

• lilyball 6y ago
  That file is new in Unicode 13. Also I think it might be based on Apple's behavior. I just tested every single emoji codepoint listed there, and it's almost entirely consistent with Apple's default rendering. And the very few exceptions (like ) actually seem to depend on whether the text renderer is styled or not, where it becomes emoji in styled fields (like Spotlight) and text in plain-text fields (like this comment box). This seems to only be done for the small handful of pre-existing text symbols that got turned into emoji and given the Emoji_Presentation property.