Princess Cut (Optimized)

Square brilliants trimmed on a 45° girdle have been marketed as “princess cuts” since the 1960s, but the modern profile—step pavilion, four chevrons on the crown—didn’t settle down until Israel “Izzy” Itzkowitz refined it in the early 80s. Since then cutters have leaned on it for fiery melee that packs more weight than rounds. The version below starts from a textbook princess recipe and pushes the angles with ProFacet’s Optimizer, which shrinks the table while lifting contrast intensity.

Like every FSL block in this book, the optimized literals (56.1315 +/- 1%, 35.1184 +/- 2%, etc.) are individually optimizable. Run the Optimizer with different weights or tweak the angles manually—pavilion and crown tiers are independent, so you can chase more brightness or shrink the table further.

FSL Spec

name = "Princess Cut Optimized"
ri = 1.54
gear = 96

G1 0 @ 90 : size xx4

P1 0 @ 56.1315 +/- 2% : cp()
p1 = ep(edge(P1:0, G1:0), 0.5)
p2 = ep(edge(P1:48, G1:48), 0.5)

P2 1 :gp() : prz(ep(p1, p2, 1 / 8), P1:0)
P3 2 :gp() : prz(ep(p1, p2, 2 / 8), P2:1)
P4 3 :gp() : prz(ep(p1, p2, 3 / 8), P3:2)

C1 0 @ 35.1184 +/- 2% : mp(P1) + girdle
C2 1 @ 30.7955 +/- 2% : gp()
C3 2 : gp() : ep(edge(C2:1, C2:95), 0.7381 +/- 0.05)
T 0 @ 0 : mp(C2)