Royal Asscher Cut under analysis

About Diamonds

“Go beyond the 4Cs, develop your eye for shape and details and always remember the right diamond, the one, will speak to you. Choose your diamond with your heart.” - Asscher family tip

Each diamond has its own individual characteristics of rarity and whiteness, as natural as human fingerprints, snowflakes and flowers. Diamonds were formed over the course of millions of years and it's over this vast amount of time their individual identity was born.

Mike Asscher examines a Royal Asscher Cut at the polishing wheel


At Royal Asscher, we see cutting as a fine art, the key to unlocking a diamond’s beauty. Each facet is carefully designed with the geometry of the shape, and its relationship to the light in mind.

Our reputation for expert knowledge and craftsmanship has lead to us cutting some of the finest diamonds in history.

Polish: As a diamond is polished, it develops a mirror-like surface. The more accomplished the polisher, the more luminous the luster.

Symmetry: Symmetry is both art and science. A diamond cutter must ensure that every facet of the diamond is perfectly aligned, mirroring and complementing its opposing facets. The more symmetrical the facets, the more powerful the sparkle.

Proportion: Proportion dictates how the diamond refracts the light. A well-proportioned diamond exhibits fire, brilliance and scintillation.

Fire: It is not just white light. Fire refers to the way that light splits into spectral colors of the rainbow, moving within a diamond.

Brilliance: Brilliance is a technical term for the abundance and return of white light from a polished stone

Shape/Finish: The final product, the shape and arrangement of facets to create the diamond as we know them today.

Royal Asscher Diamonds being colour graded


White Diamonds: “White Diamonds” are graded on a scale from D, which is colour-less, to Z, which is yellow-tinted. A grade “D” diamond is the most valuable colour because of the rarity with which it is found in nature.

Royal Asscher diamonds are independently laboratory colour-graded in perfect standardised lighting conditions. When diamonds are shown next to each other subtle differences in colour become more obvious. Our diamonds are either colourless D/E/F grades, or nearly colourless G/H/I grades.

Fancy Colours: “Fancy Colours” refer to the diamonds that have a body colour other than white. These colours can range from bright hues of yellow, orange, pink and red to darker purples, blues and even black. Some are chameleon colours, which change according to the light. Fancy colours are extremely rare and determined by trace elements in the diamonds natural growing conditions.

To find out more about sourcing a fancy coloured diamond please contact us at

Edward Asscher of Royal Asscher Diamonds examines a diamond's clarity


A diamond’s clarity is formed over the course of millions of years, deep underground as heat, pressure and volcanic forces shape the carbon atoms into diamonds as we know them.

A human cannot alter clarity, they can merely grade it — typically by inspecting it under 10 power magnification. This process allows the grader to see any blemishes or “inclusions” in the stone, determining its grade. A flawless diamond is the most rare, showing no internal flaws or external inclusions. The fewer the inclusions, the more valuable the diamond.

FL: Flawless. No internal or external inclusions or blemishes.

IF: Internally flawless. No inclusions, only insignificant blemishes.

VVS1/2: Minuscule inclusions, impossible to see with the naked eye and very difficult to see with 10x magnification.

VS1/2: Minor inclusions, that are impossible to see with the naked eye and somewhat difficult to see with 10x magnification.

SI1/2: Small, but noticeable inclusions that are clear with 10x magnification and may also be noticeable to the human eye

I1/2/3: Imperfect. Obvious inclusions that can be seen with the naked eye.

The number after the clarity grade refers to the number, size, nature and position of inclusions. Lower numbers are smaller, whiter and located on the outer parts of the diamond, which makes them harder to see and the diamond more valuable.

Royal Asscher diamonds cut for beauty, not carat yield


A diamond’s weight is measured in carats, with one carat equaling 0.2 grams. Heavier diamonds, meaning larger diamonds, are the most rare, with only one diamond—the Cullinan—weighing more than 1,000 grams.

A diamond’s weight does not necessarily determine its appearance or value. While everyone loves the glamour of a large carat diamond, two diamonds of the same weight can vary widely in price when clarity, color and cut is taken into consideration.

For this reason, Royal Asscher diamonds are cut with maximum beauty, not carat yield in mind. No matter what the size, we guarantee the ultimate expression of each individual diamond’s beauty through our signature cuts, embodying the spirit of the house in every stone.