it
really depends on the craftsmanship, not the number of prongs, for how much metal a ring shows.
Here's a 6-prong next to a 4-prong:
The 6 prong is so dainty it nearly disappears, while the 4-prong, despite having less prongs, shows way more metal. It does make the ring appear bigger from a distance, albeit more square.
From a distance, 6 prongs, what prongs? I just see a floating round stone.
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6-prongs is more secure because in case one of the prongs bends or breaks, your stone won't drop out.
I like both as long as the diamond is shiny.
eta;
gosh I fell in love with Mark Morrell's work on first sight too! He made my e-ring for me, too (not pictured here), and he was so great to work with. He's such a great photographer too! Your ring is awesome, I do love Mark's signature little heart prongs. The 4-prong I have also has little hearts for prongs but it's nowhere near his level of fluid perfection.