To be able to help you, we need their cut proportions (Table, depth, crown angle, pavilion angle, dimensions) for each stone.
Have you tried plugging the numbers into the HCA? We generally eliminate any stones with scores over 2. Scores under 2 are stones worth pursuing (a lower HCA score under 2 does not mean it is better, i.e. 1.0 isn't better than 1.8; ALL scores under 2 are acceptable).