The Princessa cut is a branded square or rectangular modified brilliant cut combining elements of the princess and radiant cuts, with additional facets engineered to increase brilliance and reduce the bow-tie effect common in square brilliants. Princessa is a trademarked name applied by a specific cutting house, and similar designs exist under different proprietary names from other makers; market acceptance for the Princessa cut and most of its near-equivalents is limited compared with the standard princess. The cut is applied primarily to diamond and to coloured stones in which brilliance is the primary marketing claim.

Position in the modified-brilliant family

Square modified brilliants split, broadly, into two design families. The princess family uses sharp ninety-degree corners and a four-fold pavilion design, with the pavilion mains running corner to corner and additional chevrons stepping from the girdle to the culet. The radiant family uses cropped or chamfered corners and a more complex pavilion design with both step-cut and brilliant facets, derived from the original Henry Grossbard Radiant Cut patented in 1977.

The Princessa cut sits between the two. Documented Princessa designs typically retain the sharp princess corners but use a pavilion structure closer to the radiant, with sixty-five to eighty-five total facets, depending on the specific Princessa variant and the cutting house. The intent of the design is to capture the higher facet count and brighter scintillation of the radiant family while keeping the cleaner square outline of the princess; the trade-off is the same complexity of facet alignment that makes the radiant family difficult to cut consistently.

The bow-tie problem

Most square and rectangular brilliants suffer from a visible darker zone, called a bow-tie, running across the table when viewed face-up. The bow-tie is a function of pavilion geometry: light that enters the table and reflects off the pavilion at the wrong angle leaks out the back of the stone in two zones either side of the centre, producing a darker band that traces the path of the leakage. The effect is most pronounced in marquise and oval cuts but is also present in poorly proportioned princess and radiant stones.

The Princessa cut markets itself partly on bow-tie reduction. The added pavilion facets break up the leakage zones and redirect more light back to the eye through the table. Whether the design delivers on that claim depends entirely on cutting precision; a poorly cut Princessa, like a poorly cut princess or radiant, can show as much bow-tie as the standard cut it was designed to improve. Bow-tie reduction is a function of cutting craft as much as of facet count.

Identification

A Princessa cut is identified by facet count, by the shape of the corners, and by any brand inscription on the girdle. The cutting houses that market Princessa-branded stones inscribe a brand mark and a serial number on the girdle, allowing the buyer to verify the cut against the cutting house's records. Without the inscription, distinguishing a Princessa from any other generic modified princess or square radiant variant is difficult under loupe; the value of the brand, as with most proprietary cuts, depends on the documentation rather than on a feature visible to a non-specialist buyer.

Magnification reveals the higher facet count on both crown and pavilion. The Princessa pattern typically shows additional star and chevron facets beyond the standard princess and a more complex pavilion than a standard radiant. The pattern is consistent across stones from the same cutting house, less consistent across the broader trademarked-Princessa category, since several houses claim the name in different markets.

Market acceptance

Princessa is one of several proprietary modified brilliants that have entered the trade since the 1990s and that have not displaced the standard princess or radiant in either retail or wholesale volume. The reasons are partly commercial and partly visual. The premium charged for the brand is small to modest, the visual difference from the standard cuts is subtle and often invisible to the customer in normal viewing, and the resale market does not preserve the brand premium. Retailers stocking modified brilliants therefore tend to anchor their inventory in the standard cuts and use proprietary variants as occasional differentiators rather than core product.

For coloured stones the picture is similar. The Princessa name has been applied to coloured stones by a small number of cutting houses, but coloured stone buyers tend to evaluate cut on a stone-by-stone basis rather than by brand, and the additional facets on a Princessa coloured stone do not necessarily improve the stone's appearance; they can also dilute the colour by adding too many internal reflections in lighter material.

Buying the cut

For a buyer considering a Princessa or any similar branded modified brilliant, the priorities are the same as for any modified brilliant. Look at the proportion data on the grading report, look at the actual stone in good lighting, and ask the seller to compare the stone side by side with a well-cut standard princess or radiant of the same weight and grade. The brand inscription matters only if the buyer specifically values it; the visual performance of the stone matters in every case.

In the trade

Branded modified brilliants come and go from the market with the marketing budgets of the cutting houses behind them. Princessa is one of a number of such brands that have appeared, found a small audience, and persisted at modest scale. The standard princess and the standard radiant remain the dominant cuts in the square and rectangular brilliant categories, and most retail buyers ultimately choose between those two rather than between a branded variant and a generic.

Further reading

• GIA — diamond cut and modified brilliant reference
• GIA Gems and Gemology — fancy-shape cut articles
• International Gem Society — princess and radiant cut reference