What actually moves the price

Seven levers, ranked roughly by how hard they pull on the invoice.

1. Natural or lab-grown

The single biggest lever by far. The same size and grades cost a small fraction grown; that one decision resets every other number on this page.

2. Carat weight, especially round numbers

Price climbs faster than size, and it leaps at milestone weights. Just-shy weights (0.90, 1.40, 1.90) look identical and skip the leap.

3. Shape

Rounds command the premium; ovals, pears, emeralds, and princesses typically price below them at equal weight while often facing up larger.

4. Color and clarity, past the visible line

Grades above eye-clean and looks-white add cost without adding anything a human can see. The grade finder hands you the line for your combination.

5. Cut quality

Costs a little more and is the one premium always worth paying; it is the sparkle itself.

6. Certificate

Paper from the major labs protects the price you pay. Lenient-lab paper quietly inflates grades, which inflates what you pay per real grade.

7. Setting and metal

The smallest lever. Even platinum and pavé are rounding errors next to the stone decisions above, which is why the stone gets decided first.