3.10 ct F VS1 Round Lab-Grown Diamond

Crown 34.4° and pavilion 40.9° are properly complementary. At a 57.0% table a 34.4° crown calls for 40.82° of pavilion and this stone delivers 40.9° — off by 0.08°. Light entering the crown is turned back through the table rather than leaking out of the pavilion. This is the one thing a round brilliant must get right, and it does. It sits on the locus Sasián et al. (2007) identified as the best-performing set, and that Cowing (2005) calls the axis of Excellent.

Balanced (lean 45/100). Near the middle of the ridge — both white return and dispersion, specialising in neither. The safest choice for unknown lighting, which for a ring worn daily is most lighting.

From the certificate text: the comments carry no treatment statement either way — worth asking the vendor, since most CVD stones receive post-growth HPHT decolourising.

Top tier — score 97.1. The geometry is as strong as certificate numbers can show: crown and pavilion in proper complement, the table where it belongs. This is the standard haus1919 curates to, and this stone clears it with room to spare. What remains — inclusion position and optical symmetry — is confirmed on the actual stone, which no certificate can show.