Peruzzi Cut Emerald: a deep cushion, lighter in weight than the same cut in diamond

Brilliance 30 · Fire 15 · Scintillation 81 · in our census, where the T73 scores 78 · 39 · 80 in emerald

In diamond the Peruzzi returns the most light of our three historic cushions, 75. In emerald it returns the least of them, 30, with Fire 15.

See it in the simulatorGet the files
The Peruzzi Cut in emerald, rendered at an angle in our 3D Gemstone Simulator under studio light
Rendered in our 3D Gemstone Simulator from the Peruzzi Cut model, 1.00 ct, studio light.

Peruzzi Cut Emerald

The Peruzzi, or triple cut, divides the crown into bezels, stars and upper halves and mirrors them below: the point where the modern facet plan appears. Our model has 74 facets on a cushion, a 56.8% table, a steep 46.0° crown and a 46.22° pavilion, 69.1% deep.

Of the cuts we measure in both stones, only the Old Single loses more light between diamond and emerald; here 75 becomes 30. Its pavilion is well above emerald's 39.4° guide minimum, so steepening it is not the answer.

Is a Peruzzi cut wise for an emerald? Pros and cons

Pros

Cons

Compared with the T73 Round Brilliant in emerald and with the Peruzzi Cut in diamond. A difference counts from 3 points (Brilliance, Fire, Tilt, Leakage), 5 (Scintillation, Symmetry), 4% (face-up size per carat) or 5% (weight); Tilt counts as a pro only for a stone within 5 points of the brilliance it is compared with. How we measure.

All eight scores against the T73

At a glance: the Peruzzi Cut in emerald (white) against the T73 Round Brilliant in emerald (dashed): solid white where it reaches further, hatched where it falls short. Each pro and con is explained, with pictures, below.

Performance wheel: Peruzzi Cut in emerald, against the T73 Round Brilliant in emerald as an outline. Solid white marks where it reaches further, hatching where it falls short. The scores are listed below.50100Global−24Brilliance−48Fire−24Scintillation+1Spread−4Symmetry−15Shape-norm−37Tilt+23

Against the T73 Round Brilliant in emerald: ahead on 2, behind on 6.

  • Global49, the comparison 73, difference −24
  • Brilliance30, the comparison 78, difference −48
  • Fire15, the comparison 39, difference −24
  • Scintillation81, the comparison 80, difference +1
  • Spread96, the comparison 100, difference −4
  • Symmetry85, the comparison 100, difference −15
  • Shape-norm47, the comparison 84, difference −37
  • Tilt100, the comparison 77, difference +23
Face-up light census, a different measure from the Cut Grading Tool; Spread and Shape-norm above 100 sit on the ring. Spread is the census's estimate from depth alone; the face-up size in the pros and cons is measured from each model's outline.
Open it in the Cut Performance Wheel

What emerald gains in a Peruzzi cut

Lighter than a diamond Peruzzi

1.02 ct at 6.5 mm, against 1.32 ct for the same cut in diamond (−23%)

A Peruzzi 6.5 mm across is 1.02 ct in emerald and 1.32 ct in diamond. The difference is density alone: 2.72 against 3.52.

Emerald1.02 ctDiamond1.32 ct
A Peruzzi Cut 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.

Try it yourself: Weights in all seven gemstones on the Peruzzi Cut page

The catch with a Peruzzi emerald

Very little fire

Fire 15 against 68 for the Peruzzi Cut in diamond: 53 points lower

15, against 68 for the Peruzzi in diamond. Of every cut we measure in emerald, only the Portuguese Bird's Nest scores less.

Peruzzi cut in emerald face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 15)

Peruzzi Cut in emerald · Fire 15

Peruzzi cut in diamond face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 68)

Peruzzi Cut in diamond · Fire 68

Look at the coloured flashes: those are fire. Same light, same size, same face-up angle; rendered by our 3D Gemstone Simulator from each cut's own model.

What helps: This is the stone. For colour with light behind it in emerald, DG-Anteros Emerald scores 52.

Try it yourself: See the fire in the 3D Gemstone Simulator

Most of the light escapes

Leakage 69 against 19 for the Peruzzi Cut in diamond: 50 points higher

69% in emerald against 19% for the same cut in diamond. Only the radiant and the Old Single leak more in emerald, both at 75%; DG-Elongated Hexagon leaks as much, 69%.

Peruzzi Cut in emerald · Leakage 69

Peruzzi cut in emerald tilted 0 degrees: Light Return map, 68% of the face leaking0° · 68% leak
Peruzzi cut in emerald tilted 10 degrees: Light Return map, 61% of the face leaking10° · 61% leak
Peruzzi cut in emerald tilted 20 degrees: Light Return map, 52% of the face leaking20° · 52% leak
Peruzzi cut in emerald tilted 30 degrees: Light Return map, 43% of the face leaking30° · 43% leak

Peruzzi Cut in diamond · Leakage 19

Peruzzi cut in diamond tilted 0 degrees: Light Return map, 22% of the face leaking0° · 22% leak
Peruzzi cut in diamond tilted 10 degrees: Light Return map, 22% of the face leaking10° · 22% leak
Peruzzi cut in diamond tilted 20 degrees: Light Return map, 24% of the face leaking20° · 24% leak
Peruzzi cut in diamond tilted 30 degrees: Light Return map, 25% of the face leaking30° · 25% leak
Each frame is the Light Return map with the stone tilted away from you by the angle shown; grey is light leaving through the pavilion. The share under each frame is that picture's own.

What helps: Steepening is not the fix: at 46.22° the pavilion is already past 39.4°. The Mazarin Cut Emerald leaks 53% as an antique cushion, the modern Cushion Cut Emerald 25%.

Try it yourself: Tilt it yourself in the simulator's light map

Less than half the T73's light

Brilliance 30 against 78 for the T73 Round Brilliant in emerald: 48 points lower

30 against 78 in emerald. The steep crown and pavilion that serve it in diamond do not suit a stone with a 39.4° critical angle.

Peruzzi cut in emerald face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 30)

Peruzzi Cut in emerald · Brilliance 30

T73 round brilliant in emerald face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 78)

T73 Round Brilliant in emerald · Brilliance 78

Red, green and blue = light returning to the eye; grey = light leaving through the pavilion. This is the head-on view; the Brilliance score averages a wider cone of light, so the score can differ from what one picture shows.

What helps: The Mazarin Cut Emerald returns 46 in the same antique outline; the modern Cushion Cut Emerald 74.

Try it yourself: Open this Light Return map in the simulator

A less regular pavilion

Symmetry 85 against 100 for the T73 Round Brilliant in emerald: 15 points lower

Its pavilion combines facets of unequal size, which our symmetry score marks down to 85; the figure belongs to the design and is identical in diamond.

Peruzzi Cut · 74 facets · Symmetry 85

T73 Round Brilliant · 73 facets · Symmetry 100

Symmetry scores how regular the pavilion facets are within the design. Compare how evenly the facets repeat around each pavilion. Drawn from each cut's own model.

What helps: It is the design. The Mazarin Cut Emerald keeps a fully regular plan, 100.

Try it yourself: Compare the Symmetry spoke in the Cut Performance Wheel

Who a Peruzzi emerald suits

We would not choose a Peruzzi for an emerald where light matters: it is the dimmest antique cushion we measure in the stone, and it has almost no fire. It suits a collection that needs the Peruzzi plan in every material.

For an antique cushion in emerald, the Mazarin Cut Emerald. For a modern one, the Cushion Cut Emerald. In diamond the Peruzzi is a far stronger pairing: see the Peruzzi Cut Diamond.

Peruzzi Cut Emerald: questions

Is a Peruzzi cut good for emerald?

No, on our numbers: Brilliance 30 against 78 for the T73, Fire 15, and 69% of the light leaking.

Why is a Peruzzi emerald so much darker than a Peruzzi diamond?

The cut is the same; only the stone changes. Diamond turns back any ray that meets a facet more than 24.4° from the perpendicular; emerald turns back only rays past 39.4°. The Peruzzi's light paths depend on that margin: 75 in diamond, 30 here.

Peruzzi or Old Mine for an emerald?

The Old Mine returns more light (40 against 30), leaks less (60% against 69%) and has more fire (25 against 15). Scintillation is level, 81 against 81.

What does a 6.5 mm Peruzzi emerald weigh?

1.02 ct, from our model's volume; a diamond Peruzzi of that width is 1.32 ct.

Get the Peruzzi Cut files

6 formatsMillimetresWatertight

Peruzzi Cut 3D files

The Peruzzi Cut as exact geometry: 74 planar facets, real-world scale, ready for CAD, rendering, printing and casting.

  • STEPExact faceted solid for CAD
  • 3DMRhino, closed mesh on its own layer
  • STLWatertight mesh for printing and casting
  • OBJMesh for modelling and rendering
  • FBXBlender, 3ds Max, Maya, Cinema 4D, Unity, Unreal
  • GLBWeb, AR and quick previews
€9.99 · Personal useBuy the 3D files
GemCad96 index

Peruzzi Cut cutting files

The Peruzzi Cut as a faceting design: 58 + 16 girdles = 74 facets, 96 index, 4-fold mirror-image symmetry, ready for the machine.

  • .ascGemCad design file, 96 index gear
  • .csvTier table: angles, indices and cutting order
  • DiagramPrintable faceting diagram
€9.99 · Personal useBuy the cutting files

Questions before you buy? Email us.

More gemstones and cuts

Emerald: optical properties and the top ten cuts · The Peruzzi Cut: specifications, model and files

Other cuts in emerald

The Peruzzi Cut in other gemstones