Opinions and Advice for selecting rings

[tote13]

Can anyone please share their experience with CBI diamonds in color range of H,I and J. Is there a noticeable differences between those colors?

I am so perplex about these diamonds. Is there a huge differences in carat size between 1.6 to 1.8?

Here are my list:
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10753
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10725
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10673

These two looked great value in terms of cost.
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10327
https://www.hpdiamonds.com/en-us/diamonddetail/HPD10663

Can you please let me know which would be the best one to go for among those choices?

Thanks!