Your-Loose_Diamond  

About Your Loose Diamonds Cut

 

 

 

Cut Quality For Loose Diamonds

The cut of a diamond is related to the proportions and symmetry of a diamond.  Often cutters choose to sacrifice some of the diamond's beauty to achieve a stone that is a larger carat weight.  Cut, more than any other quality aspect, gives the diamond its sparkle.  A diamond gets its brilliance and scintillation by cutting and polishing the diamond facets to allow the maximum amount of light that enters through its top to be reflected and dispersed back, also through its top.  With proper cutting (diagram 1) the light passes through the top, bounces off the sides, and then travels back out the top, giving the diamond optimum brilliance. If the diamond is cut too shallow (diagram 2), light passes through the bottom of the diamond.  If the diamond is cut too deep (diagram 3), light passes through the side of the diamond, in both cases inhibiting maximum brilliance.

Two popular overall proportion indicators are Total Depth Percentage (D%) and Table Percentage (T%) .  D% is the diamond's depth expressed as a percentage of its width (average diameter for rounds).  T% is the diamond's "table" width expressed as a percentage of its overall width (diameters for rounds).  Round diamonds with cutting proportions within the range generally considered attractive have depths from 55 to 63 percent.  The table size of most round diamonds lies between 56 and 64 percent .  With non-round shapes ("fancy"  shapes), much greater  proportion  variations  are encountered.  In most fancy shapes, higher D% and T% are more common and are dependent on width to length rations.  

 

 QUICK REFERENCE GUIDE TO DESIRABLE CUT PARAMETERS  

PARAMETERS

S  H  A  P  E  S

(In Importance Order)

ROUND

PEAR

MARQUISE

OVAL

Depth%

59 - 62.5

59 - 66

59 - 66

59 - 66

Table %

53 - 61

54 - 62

54 - 62

54 - 62

Length/Width Ratio*

N/A

1.50-1.75

1.75-2.25

1.30-1.65

Girdle Thickness

V.Thin-Thick

Thin-Thick

Thin-Thick

V.Thin-Thick

Florescence**

None - Faint

None - Faint

None - Faint

None - Faint

Symmetry

Excl.- Good

Excl.- Good

Excl.- Good

Excl.- Good

Polish

Excl.- Good

Excl.- Good

Excl.- Good

Excl.- Good

Culet Size

None-Med.

None-Med.

None-Med.

None-Med.

         
         
         
         

 

PARAMETERS

S  H  A  P  E  S

(In Importance Order)

EMERALD

PRINCESS

RADIANT  

HEART

Depth%

60 - 75

64 - 79

62 - 75

56 - 62

Table %

59 - 75

60 - 75

58 - 75

54 - 62

Length/Width Ratio*

1.4-1.7 / 1

1.0-1.2 / 1

1.2-1.5 / 1

.9-1.1 / 1

Girdle Thickness

V.Thin-Thick

Thin-Thick

V.Thin-Thick

Thin-Thick

Florescence**

None - Faint

None - Faint

None - Faint

None - Faint

Symmetry

Excl.- Good

Excl.- Good

Excl.- Good

Excl.- Good

Polish

Excl.- Good

Excl.- Good

Excl.- Good

Excl.- Good

Culet Size

None-Med.

None-Med.

None-Med.

None-Med.

* Only in reference to Fancy Shapes and depends on personal taste.

** Most Significant with high colors (actually helps lower color diamonds).

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