Gray Heart Emoji

Emoji development falls under the auspices of Unicode, not Apple. Apple and other companies simply add new ones as issued by Unicode. - http://unicode.org/reports/tr51/

Search if the character you wish is already under development: https://emojipedia.org

or propose one to them at: https://unicode.org/emoji/proposals.html

Apple added it in 16.4. If you haven't already installed it, update the unit.

For reference, most emojis are created by the Unicode Consortium, not Apple.

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