Born on 21 May: Star Sign, Birthstone and Birthday Facts

October 7, 2026

If your birthday is on 21 May, your star sign is Gemini (the Twins, 21 May to 20 June), your birthstone is emerald and your birth flower is lily of the valley and hawthorn.

21 May is the 141st day of the year (the 142nd in a leap year). In 2026 it falls on a Thursday, and in 2027 on a Friday.

21 May is close to the change of star sign, so some people born today read the neighbouring sign too. The exact cut-off shifts slightly from year to year.

Gemini personality traits

Curious and witty
Sociable
Adaptable
Easily bored
A great talker

Birthday gift ideas for 21 May

A quiz or trivia game
A book subscription
A podcast mic
Something with emerald, the May birthstone
A bunch of lily of the valleys, the May birth flower

Birthday messages for a 21 May birthday

Happy birthday to the best conversationalist I know!
Double the fun, double the cake. Happy birthday, Gemini!
Wishing you a year full of new adventures and good chats.
Happy 21st of May! Hope your day is as brilliant as you are.

Key things to remember

Pair a star sign card with a small birthstone gift for a personal touch.

Frequently asked questions

What star sign is 21 May?

Gemini (21 May to 20 June).

What is the birthstone for 21 May?

Emerald, the birthstone for everyone born in May.

What is the birth flower for 21 May?

Lily of the valley and hawthorn.

What day is 21 May 2026?

Thursday.

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