Using emoji in your bot tends to make things a bit less robotic. Here is how you can accomplish that with Tourmaline.
Of course one of the best ways to include emojis in your messages is to just use an emoji keyboard and paste the raw emoji into your messages. Crystal is UTF8 compatible and won't freak out.
send_message(message.chat.id, "Hello world 🌎")
require "emoji" # bot definition... send_message(message.chat.id, Emoji.emojize("Hello world :earth_americas:"))
emoji.cr uses regex to find and replace shortcodes with emoji, it would be a good idea to
put any emoji messages into a constant so that it's not finding and replacing that shortcode every time.