1.65 ct D VS1 Round Lab-Grown Diamond

Crown 33.6° and pavilion 40.9° are properly complementary. At a 57.0% table a 33.6° crown calls for 40.98° 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.

Strongly brightness-biased (lean 5/100). The shallow crown and large table return light white rather than splitting it. Bright and clean indoors and under overcast sky, and it photographs well — but little fire under spotlights, and watch for a flat, glassy look if the contrast pattern is weak. Judge it in everyday diffuse light before concluding — that is where this make earns its keep.

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 96.9. 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.