Diamond Clarity and Cut

DIAMOND CLARITIES (clarity or purity grading)

 

FL Flawless – Loupclean No faults, whether inside or outside, are visible with a loupe  

IF Internally Flawless No internal faults visible with a loupe (minor finish faults)

VVS1 Very Very Small Inclusion(s) Minor faults very very difficult  to see with a loupe 

VVS2 Very Very Small Inclusion(s) Minor faults very very difficult  to see with a loupe

VS1 Very Small Inclusion(s) Minor faults very difficult  to see with a loupe

VS2 VerySmall Inclusion(s) Minor faults very difficultto see with a loupe

SI1 Small Inclusion(s) Minor faults difficult to see with a loupe

SI2 Small Inclusion(s) Minor faults difficult to see with a loupe

SI3 Small Inclusion(s) Minor faults difficult to see with a loupe

I/ P1 Small Inclusion(s) Minor faults visible without a loup, by a qualified observer’s naked eye 

I/ P2 Bigger/More Inclusions Faults highly visible, without a loup, with the naked eye 

I/ P3 Bigger/More Inclusions Faults highly visible, without a loup, with the naked eye


Nota bene :  

. ‘Loupe’ = magnifying lense x 10 used by a trained eye, a qualified observer ; the more pure, the higher the 

   value ;  professional certification requires additional viewing under a specific microscope ;

. Clarity grading according to presence, absence or abundance, of characteristics / inclusions : the type 

  (+/- a dozen of different types of  internal or external ‘characteristics’ are in nature), size, location, 

   quantitiy  which all (might) affect the clarity, hence eventually affect the shine – fire – brilliance – sparkling    

   of the polished stone ( I/P stones when nicely polished could still sparkle vey nicely ..);

.  Faults can be internal & or external, which is linked the finish/polishing of the stone ;

.  I/P : ‘I’ for ‘imperfect’ or ‘P’ for ‘piqué’.

 

 

DIAMOND CUT

Cut is linked to the shape or make, the polish of a stone, its proportions, the symmetry and finish.

Polishing requires several manufacturing steps : marking of the rough stone, cleaving or sawing of the rough, bruting (roughly shaping the future end-product), faceting in several stages. Flat facets are being polished and organized in order to form a specific geometric shape ; each facet has to show the right proportions, angles and finish, according to specific rules and percentages hereby enabling the light to travel through the stone (reflection) in the best possible way which in the end will make the stone shine as a ‘brilliant’.

A polished (round) diamond generally shows following sections : a table on top, a crown, a girdle, a pavilion and finally a culet.

A round diamond shows 57 facets + a culet, which will eventually be pointed or faceted. Thanks to the exceptional hardness ’10’ of diamonds the sharp edged facets wont fade away on your beloved diamond jewellery, which will enable you to pass these polished stones on to next generations almost untouched, when set, worn and cleaned properly.   

The finish grade, determined according to the proportions and the absence or presence of symmetry deviations, ranges from ‘excellent’or ‘ideal’, down to ‘very good’, ‘good’, ‘medium’ or ‘fair’, ‘poor’.

Thanks to endless creativity and enhanced techniques the polishing has grown through the ages from a few irregular facets on a rough stone, to the most magic sparkling of very elaborate geometric diamond creations.

Common diamond shapes are : the ‘round’ brilliant, the ‘oval’ cut, the ‘pear’ shape or drop, the ‘heart’ shape, the ‘emerald’ cut, the ‘baguette’ cut, the ‘princess’ cut, the ‘radiant’ cut, the ‘cushion’ cut etc.  The best polishers often design original fancy shapes, amongst which the most astonishing geometric creations.

Cabochon stones are generally colour gems, which have been round-polished without facets.     

+ ad profile of a cut round diamond (different facets)

+ ad common shapes In addition to the ‘4 C’s’, cut, carat, colour, clarity, .. the ‘C’ of confidence is getting even more important in order (1) to avoid any confusion between natural diamonds and their many simulants, as well as lab-grown stones ; (2) also viewing full disclosure of any 4 C’s – treatment which might affect the quality, hence the value of a stone.

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