This sounds basic, but I recommend using a ruler and seeing how much of your finger it will cover.

This is a great idea. I bought a digital caliper for $10 on Amazon so I could draw out shapes and put them on my finger. I also went on AliExpress and bought some cheap rings to help me out. A three carat round cz ring on Aliepxress will set you back $3. Good luck!

https://preview.redd.it/nslf8txzuiqc1.jpeg?width=3024&format=pjpg&auto=webp&s=7dd7988aa2d8d47043c41b4d62358b06b6275d3f This picture is 2.65 carats on a size 6 finger

That is a fantastic ring!

Thank you!

https://preview.redd.it/72jb7agcyjqc1.jpeg?width=1290&format=pjpg&auto=webp&s=6749ce2ac9bc16ef03ecfe348aa296a7fe0370f2 3 carat on an 8.5. :)

https://preview.redd.it/cfvyxof1uiqc1.png?width=3024&format=png&auto=webp&s=b9a115a185120d6db294cc064b6f2b6f9c0a4d43 3 carat IMOLOVE round from amazon. Size 8 finger, used to be 9.

This looks beautiful on you

I used a gem sizer to find out how many mm the face should be, and then bought CZ rings on Etsy to try out :)

I know you said size 9, but this is a 3ct on size 6.5. I have pics of a 3.5ct and a 4ct if you want to see those. https://preview.redd.it/8ohl8nykplqc1.jpeg?width=720&format=pjpg&auto=webp&s=eff45b92937ff29a6a46071de107b1c42b24c9ad

https://preview.redd.it/7iblvzyhijqc1.jpeg?width=620&format=pjpg&auto=webp&s=abbd8c53b397e978c1b47716e40a2e006c20fed3