The emerald lock currently looks like a green world lock with 8 black dots, two "clovers". The reason for the dots is world paint. When the paint was introduced, people could paint the worldlock green and scam that way. It would be amazing if the emerald lock texture would change.
Name:  RubyLock vs EmeraldLock.png
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My suggestion is a clover instead of the keyhole. This is similar to the Ruby Lock (Valentines). Thanks if you'd change the texture!