A briolette diamond is a diamond fashioned in the briolette cut: an elongated, pear- or drop-shaped form covered entirely in triangular or rectangular facets, with no table, no crown, and no pavilion in the conventional sense. The narrow upper end is drilled to accept a wire or setting for suspension, allowing the stone to hang freely and rotate, scattering light in every direction. Among the oldest documented diamond cuts, the briolette predates the modern brilliant by several centuries and retains a singular place in the history of jewellery — appearing in Mughal imperial treasuries, the collections of European royalty, and the catalogues of the great twentieth-century auction houses. Today, briolette diamonds are rare in commercial production, cut almost exclusively on commission for high jewellery pendants and earrings, and valued as much for their historical resonance as for their optical performance.

The Cut: Geometry and Optical Character

The defining geometry of the briolette is its fully faceted surface — no flat table interrupts the form. Facets typically number between 48 and 84, arranged in horizontal rows that encircle the stone from the drilled apex to the rounded base. The facets are most commonly triangular (trigons) or rhomboidal, and their arrangement varies between cutters; there is no single standardised facet layout equivalent to the GIA's round brilliant specifications. This absence of standardisation means that no two briolettes are optically identical, and the quality of a given stone depends heavily on the skill with which the cutter has balanced facet angles to maximise internal reflection.

Because the briolette lacks a table and girdle, light enters and exits through every facet simultaneously. When the stone is suspended and free to rotate — as it is designed to be — the result is a continuous, shifting play of brilliance and dispersion. The effect differs markedly from a brilliant-cut diamond viewed in a fixed setting: rather than a concentrated pattern of brightness, the briolette produces a more diffuse, scintillating luminosity that responds to the wearer's movement. This quality made it particularly prized in candlelit court environments, where movement and flame conspired to animate the stone.

Historical Origins and Royal Provenance

The briolette cut is generally considered to have originated in India, where diamond cutting was practised from at least the fourteenth century. Early Indian cutters worked with the natural octahedral cleavage of rough diamonds, and the elongated drop form — suited to pendant jewellery — was a logical development from that tradition. The Mughal emperors were particularly enthusiastic patrons of briolette-cut stones; surviving miniature paintings and inventories from the courts of Akbar, Jahangir, and Shah Jahan document pendant diamonds of this form suspended from turban ornaments (sarpech), necklaces, and earrings.

European contact with Indian diamond production, intensified through Portuguese and later Dutch and British trade routes from the sixteenth century onward, brought briolette diamonds into Western royal collections. The French crown jewels included several notable briolettes, and the form was fashionable throughout the seventeenth and eighteenth centuries in the jewellery of the French, Spanish, and Austrian courts. By the mid-nineteenth century, the rise of the old mine cut and, later, the modern brilliant had displaced the briolette from mainstream production, relegating it to a specialist and antiquarian interest — though never extinguishing it entirely.

Notable Stones

Several historic briolette diamonds have achieved lasting fame. The Briolette of India — a colourless briolette of approximately 90.38 carats — is among the most celebrated, with a provenance tradition linking it to the medieval Indian diamond trade, though documentary evidence for its earliest history is incomplete. It appeared at auction in the twentieth century and has passed through several distinguished collections. The Taylor-Burton Diamond, while primarily known as a pear-shaped brilliant, is sometimes cited in discussions of briolette provenance because Richard Burton initially presented Elizabeth Taylor with a briolette diamond pendant before acquiring the more famous stone — illustrating the cut's enduring association with romantic and theatrical gesture.

Coloured briolette diamonds of significant size are exceptionally rare. Fancy yellow and fancy brown briolettes appear occasionally in the auction market; fancy pink and fancy blue examples of notable size are effectively unique. Christie's and Sotheby's have both offered important briolette diamonds at auction in recent decades, with prices per carat for fine colourless examples frequently exceeding those of comparable brilliant-cut stones, reflecting the combination of rarity, historical prestige, and cutting labour.

Cutting Challenges and Material Loss

The briolette imposes severe demands on both the rough diamond and the cutter. Because the form is fully three-dimensional and symmetrical about its vertical axis, the rough must be of sufficient size and shape to yield an elongated drop without excessive sacrifice of material — a requirement that typically means beginning with a well-formed octahedral or macle crystal. Material loss in cutting a briolette is substantially higher than for a round brilliant of equivalent finished weight: estimates in the trade commonly place the yield at 40 to 55 per cent of rough weight, compared with roughly 50 to 60 per cent for a well-proportioned round brilliant from comparable rough. The drilling of the suspension hole — which must be precisely centred at the apex to ensure the stone hangs true — adds a further technical risk, since an off-centre or fractured drill channel can render the finished stone unsaleable.

Faceting itself is time-intensive. Each row of facets must be cut and polished to consistent angles, and the absence of a standardised layout means the cutter must make continuous judgements about facet size and placement as the work progresses. For these reasons, briolette cutting has largely disappeared from commercial production; the stones that appear in the contemporary market are either antique pieces, recuts of damaged or poorly proportioned older stones, or custom commissions executed by a small number of specialist cutters in Antwerp, Mumbai, and New York.

The Drilling and Setting

The drilled apex is both the briolette's most practical feature and its most technically vulnerable. Historically, the hole was made using a pointed diamond fragment rotated against the stone with abrasive powder — a slow and exacting process. Modern lapidaries use diamond-tipped drill bits under water cooling, which reduces the risk of thermal fracture but still requires care to avoid chipping the thin walls of stone at the apex. The diameter of the hole is typically 0.8 to 1.5 millimetres, sufficient to accept a fine gold or platinum wire bail.

Settings for briolette diamonds are almost invariably minimal by design: a simple wire cap or a delicate claw arrangement at the apex, intended to be as unobtrusive as possible so that the stone's form and faceting remain the visual focus. Some high jewellery commissions use a pavé-set cap that adds a secondary sparkle at the point of suspension; others employ a plain polished metal collar. The stone is never bezel-set around its body, as this would obstruct the facets and defeat the optical purpose of the cut.

Contemporary Market

In the contemporary high jewellery market, briolette diamonds appear most frequently as pendant drops in earrings and necklaces, where their freedom of movement is fully exploited. Carat weights in commercial production typically range from under one carat to approximately ten carats; stones above twenty carats are rare, and those exceeding fifty carats are exceptional by any measure. Colourless briolettes of high clarity command premiums over brilliant-cut diamonds of similar weight, reflecting their scarcity and the labour involved in their production. Fancy-coloured briolettes — particularly in pink, blue, or vivid yellow — are treated by the major auction houses as collector's objects rather than simply jewellery components, and are priced accordingly.

The GIA issues grading reports for briolette diamonds, assessing colour, clarity, and carat weight; cut quality is described in narrative terms rather than assigned a grade on the standard Excellent–Poor scale, since the briolette's non-standardised facet arrangement does not lend itself to the proportional analysis applied to round brilliants. Buyers and dealers therefore rely more heavily on direct examination and the reputation of the cutter when assessing briolette quality than they would for a certified round brilliant.

Further Reading

• GIA — History of the Briolette Cut
• GIA Gems & Gemology — archived issues