IMO if you want a standard round to darken less in stronger more direct lighting, it’s less about the right numbers to look for and more about the cut precision. Most commonly available standard round proportions with good cut precision are going to darken in stronger more direct lighting and show fire. That’s what the cut is designed to do!
Essentially what you are asking for is a poorly executed standard round cut to increase the chances that it would darken less in stronger more direct lighting. To get to that point you would need poor cut precision to break up the standard round facet pattern, and avoid too much obstruction or leakage that would make it dull and lifeless.
Light leakage is when you can see straight through the stone. Essentially facets that are not returning any light, highlighted in yellow. Tiny bits of leakage that move around as the diamond tilts can add contrast, bigger stationary areas can make the diamond look dull and lifeless.
Thank you! I appreciate you taking the time. That’s what @yssie said as well. It seems like I’m focusing more on the numbers and not what matters the most in this situation - the cut! I’ll keep looking and focus my search on more splintery faceting. Thank you again!
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