When your organization have applied Organization Validation, a V3 Identity Certificate will be configured for all employees automatically for free, all employees use this certificate to send signed email that display V3 icon in the email. If you receive email from your colleague that display V4 icon, this means he/she applied the V4 Identity Certificate.
If you applied Individual Validation using your personal email, and your company applied Organization Validation, then you can apply the V4 Identity Certificate for free. If you don’t apply Individual Validation, but your company applied Organization Validation, then you can apply the V4 Identity Certificate, but you need to pay for this by yourself, after finishing the application, then you are qualified to apply Individual Validation for free and get the V2 Identity Certificate for free. This means that you just need to pay one for Individual Validation or for V4 Identity Certificate, you will get two identity certificates (V2 and V4).