Brilliant Cut

The classic round brilliant maximizes sparkle by balancing crown height, pavilion depth, and table ratio. Use this template as a familiar starting point.

Sources

• https://www.gia.edu/round-brilliant-cut-diamond
• https://en.wikipedia.org/wiki/Round_brilliant
• https://en.wikipedia.org/wiki/Tolkowsky

FSL Spec

name = "Example: Round Brilliant"
ri = 2.46
gear = 96

P1 3 @ 41.0 : cp() xx8
G1 3 @ 90.0 : size
P2 0 @ 39.8 : gp()
C1 3 @ 50.0 : mp(P1, P2) + girdle
C2 0 @ 38.0 : gp()
C3 6 @ 26.0 : mp(C1)
T 0 @ 0 : mp(C2) x1

-- lua script
name("Example: Round Brilliant")
ri(2.46)
gear(96)

local girdle = Point(0, 0, 0.04)
local size = 1.0

TierAP("P1", 3, 41.0, cp(), "xx8")
TierAD("G1", 3, 90.0, size)
TierAP("P2", 0, 39.8, gp())
TierAP("C1", 3, 50.0, mp("P1", "P2"):add(girdle))
TierAP("C2", 0, 38.0, gp())
TierAP("C3", 6, 26.0, mp("C1"))
TierAP("T", 0, 0, mp("C2"), "x1")