Northstar

by Arya Akhavan (November 2013)

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L/W: 100%
Design RI: 1.58
H/W: 72%
Gear: 120
V/W³: 0.335
Symmetry: 4 (mirrored)
Facets: 59
Tiers: 11
Crown: 17
Pavilion: 42

Someone once said that it would be impossible to do a "Lone Star"-style cut in a square shape. Well, here's a square version with a prominent star and a surprising amount of light return, and it follows meetpoint faceting! Works in materials from beryl to rutile (RI = 1.58 - 2.62) with no changes, but looks best in light blue topaz. Suggested size = 10-25 mm

Wireframe

Pavilion

#	Angle	Facets	Notes
G1	90.00°	120 30 60 90	Set stone size.
G2	90.00°	15 45 75105	Meet P2, G1; P2, P3, G1
P5	68.04°	120 30 60 90	Level girdle.
P4	63.79°	15 45 75105	Level girdle.
P3	43.84°	19 43 53 67 77101	Meet P1, P2
P2	43.44°	6 18 30 42 54 66 78 90102114	Establish star size.
P1	41.50°	4 20 28 44 52 68 76 92100116	Cut to centerpoint.

Crown

#	Angle	Facets	Notes
C1	41.15°	120 30 60 90	Set girdle width.
C2	39.74°	15 45 75105	Level girdle.
C3	34.13°	2 28 32 58 62 88 92118	Meet G1, G2, C1, C2
T	0.00°	30	Meet C1, C3; C2, C3