From brilliant to oval in one click
Choose a new shape and a length / width ratio: Facet Lab recalculates the facets, angles and index to keep the spirit of the original diagram.
Gem cut design software · Windows
Design the cut before you touch the stone.
Facet-by-facet diagrams, calculated angles and index, light return simulated according to the material’s refractive index.
The cutting steps
From rough to polish, every tier is planned.
The cutting sheet follows the actual order of work at the machine: pavilion, transfer, then crown, with angle and index for each tier.
A — CROWN
B — PAVILION
| # | TIER | ANGLE | INDEX /96 |
|---|---|---|---|
| 01 | Mains p. | 40.80° | 96-12-24… |
| 02 | Halves p. | 41.50° | 03-09-15… |
| 03 | Table | 0.00° | — |
| 04 | Stars | 15.00° | 06-18-30… |
| 05 | Mains c. | 34.50° | 96-12-24… |
| 06 | Halves c. | 42.00° | 03-09-15… |
RI 1.76057 facetsCorundumYield 31.4 %
Features · automatic recalculation
Change the shape or the material, everything is recalculated.
Angles, index, meet points and rendering are updated automatically. Every value remains adjustable by hand.
| SAPPHIRE | QUARTZ | |
|---|---|---|
| Refractive index | 1.760 | 1.544 |
| Critical angle | 34.6° | 40.4° |
| Pavilion mains | 40.80° | 43.00° |
| Crown mains | 34.50° | 42.00° |
Manual adjustmenton
From sapphire to quartz, angles re-optimized
A cut optimized for sapphire can be transposed to quartz: the angles are recalculated for the new refractive index. You stay in control of every value.
Concave modeling
Concave facets, finally modeled the way they are cut.
Specify a cylindrical or conical lap, its diameter and its orientation: Facet Lab calculates the curved surface of each facet, its meet points and its effect on brightness in the render.
- Laps
- cylinder · cone · sphere
- Lap diameter
- 3 to 40 mm
- Flat / concave mix
- per tier of facets
- Simulation
- ray tracing of curved surfaces
Edge frosting
Frosted edges that outline the stone with a white line.
Most often on the pavilion, sometimes on the crown: choose the tiers and the width of the band, and Facet Lab adds a thin frosted facet along each edge. The render immediately shows what frosting changes: a white line that outlines the stone and a different brilliance, where a soft, satin glow joins the sparkle. A whole tier can also be frosted in one click.
- Side
- pavilion or crown
- Band width
- 0.02 to 0.6 mm
- Frosted edges
- by tier, girdle optional
- Effect on the render
- light return and brilliance recalculated
Bicolor stones
Place the color boundary before the first facet.
Tourmaline, ametrine, zoned sapphire: define two color zones and the plane that separates them, then orient the cut to get a sharp transition or a blend across the table.
ZonesTwo colors and indices per stone
PlaneAdjustable angle and position
RenderCrown, profile and table preview
CROWN VIEW
PROFILE · PLANE 12°
Multicolor and zones
Beyond two colors, beyond a single line.
Combine separation planes and selected zones to reproduce the actual color distribution of the rough.
- pink
- yellow
- green
- blue
Multiple separation planes
Add as many planes as there are colors, each with its own angle and position.
Free zones
Draw a zone with the lasso or as an ellipse for a colored core, an inclusion or a spot.
Combinations
Mix planes and zones on the same stone; each zone gets its own color and index.
Inclusions
Frost, fractures, rutile: cut with full knowledge.
Place the rough’s inclusions inside the stone, with sliders (position in mm, size, tilt) or by dragging them in the view: their effect is calculated by the render and counts in the scores and optimizations.
Frost
Healed fracture, a sheet of fine droplets: the render shows the silvery veil it gives at grazing angles.
Fractures
Open fracture filled with air: white flash, total reflection, dead zones. You see before cutting whether the cut hides it or shows it off.
Rutile, clouds, gardens
Rutile needles (the “silk” of corundum), clouds, gardens, crystals and tubes, placed one by one or as a cluster in one go.