My first ever diamonds! anyone recognise the markings?

[Alliecat1101]

My grandpa gave me this stunner (I picked, he paid) for my 21st birthday which is next week. I couldn't be happier with it, it is just so pretty. It's marked 0.50 9k, and also TWI (or TW1, maybe?) IND. It's so sparkly, fits my big fat finger perfectly, was an absolute bargain and I'm in love. Also, I hope I've posted this correctly, I'm new here. Sorry if I'm on the wrong board.

 

[tyty333]

Congratulations!!! So sweet of your grandpa to treat you for your 21st birthday! Happy Birthday!

They do look very sparkly!

 

[Rockinruby]

Very pretty! What a nice thing to do for your birthday! It looks great on you!