Lapidary Journal: Trilnot Number 4 - January 2001 Jewelry Journal

Lapidary Journal Jewelry Artist: Gems, Beads, Jewelry Making and more

Trilnot No. 4 Cut
By Charles Covill
Intermediate faceting project.

While the shape of this cut (here, shown in blue topaz) is similar to a triangle, it's not a true triangle because of the soft corners. To get the name, I combined the first three letters of “triangle” and the word “not” to get “trinot.” This didn't sound quite right, so I added the “l,” and voila: trilnot.

Angles for R.I = 1.610
43 + 13 = 58 facets
3-fold, mirror-image symmetry
Several clear glass punties (handles)
96 index
L/W = 1.106

L/W = 1.106
T/W = 0.540
U/W = 0.509
P/W = 0.496
C/W = 0.131
Vol./W3 = 0.194

For information on supplies, please see the Annual Buyers' Directory.
Always ask for the MSDS (Material Safety Data Sheet) for any materials you buy, which will give you reactivity, health hazard, and safe handling data.

PAVILION
STEP	ANGLE	INDEX
1	41.00°	14-18-46-50-78-82; cut to meetpoint at temporary cutlet
2	52.37°	02-30-34-62-66-94; meetpoint with 1 at temporary cutlet
3	54.00°	96-32-64; meet 1 and 2 at temporary culet
G1	90.00°	14-18-46-50-78-82; start level girdle
G2	90.00°	02-30-34-62-66-94; continue level girdle
G3	90.00°	96-32-64; complete level girdle
4	51.00°	01-31-33-63-65-95; meet 2 and 3 at girdle, make new cutlet

CROWN

STEP ANGLE INDEX

1 35.00° 14-18-46-50-78-82; determine girdle thickness

2 35.00° 02-30-34-62-66-94; continue level girdle

3 35.71° 96-32-64; complete level girdle

T 0.00° Table; meetpoint with 2, 3, and 4

4 17.60° 09-23-33-63-65-95; meet 2 and 3 at girdle, make new cutlet

The author of a book on faceting, Charles Covill is an Austin, Texas-based cutter. Several of his designs have appeared in various facetors' guild newsletters.

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CROWN
STEP	ANGLE	INDEX
1	35.00°	14-18-46-50-78-82; determine girdle thickness
2	35.00°	02-30-34-62-66-94; continue level girdle
3	35.71°	96-32-64; complete level girdle
T	0.00°	Table; meetpoint with 2, 3, and 4
4	17.60°	09-23-33-63-65-95; meet 2 and 3 at girdle, make new cutlet