A round brilliant diamond refracting light into prisms of fire.
The Maison · Diamond Education

A Guide to Diamond Cut.

“Of the four characteristics, cut is the one shaped entirely by the hand of the master — the choreography of light, written in stone.”

The cut of a diamond is paramount in revealing its inner brilliance and fire. Beyond mere shape, it encompasses the precise artistry of proportions, symmetry and polish that dictate how light moves within the stone — entering, reflecting from facet to facet, and returning to the eye as brilliance, fire and scintillation.

Of all the diamond's qualities, cut is the only one entirely shaped by the human hand. A degree's misalignment can quiet a stone; a faultless cut can lift it into radiance.

II · Anatomy of a Diamond

The architecture of light.

01
Table
The flat, uppermost facet — the principal window through which light enters.
02
Crown
The angled upper section that disperses light into the play of fire.
03
Girdle
The narrow band where crown meets pavilion — the diamond's widest circumference.
04
Pavilion
The lower facets that reflect light internally and return it to the eye.
05
Culet
The point at the very base — ideally so small as to be invisible.
III · The Grade of Cut

From excellent, downward.

01
Excellent
Maximum brilliance and fire. The proportion the Maison favours.
02
Very Good
Reflects nearly as much light as Excellent, with subtle variance.
03
Good
Reflects much of the light entering the stone.
04
Fair
Acceptable, though noticeably less brilliant.
05
Poor
Light escapes through the sides or bottom of the stone.
IV · The Family of Shapes

A vocabulary of silhouettes.

01

Round Brilliant

The pinnacle of brilliance — 57 facets engineered to return the fullest play of light.

02

Oval

An elongating silhouette that flatters the hand with quiet elegance.

03

Emerald

A step-cut of architectural restraint, revealing clarity in long, mirrored facets.

04

Cushion

Soft corners and chandelier-like fire — at once antique and modern.

05

Pear

A teardrop of motion, drawing the eye along its tapered point.

06

Marquise

A storied silhouette, prized for the length it lends the finger.

A Giuliana round brilliant diamond ring.
V · The Giuliana Standard

Cut to reveal a stone's truest light.

We select only diamonds that exemplify superior cut quality.

Whether the timeless allure of a round brilliant or the refined elegance of an emerald cut, each piece is chosen so that it radiates with the fullest possible play of light — proportion meeting polish, symmetry meeting intent.

A diamond resting on warm ivory silk.
Private Consultation

See the difference, in person.

The mastery of cut is most fully understood under daylight, in the hand. Arrange a private appointment with a Giuliana adviser to experience it for yourself.