color

White Color

yellowish

brown

Pink

Grey

Green

 

Diamond Color Guide

• D   E
• F   G
• H   I
• J   K
• L   M
• N   O - P

 

 

Premium White

White

Tinted White

Slightly Tinted

Faint Yellow

 

CLARITY

The clarity grading of a Diamond is based on the number of inclusions and range from internally flawless to I3 (many internal inclusions) and we grade the Diamonds based on the following internationally accepted criteria.

 

FL

Flawless

IF

Internally Flawless

VVS1

Very very slightly included 1

VVS2

Very very slightly included 2

VS1+

Slightly better than VS1

VS1

Very slightly included 1

VS2+

Slightly better than VS2

VS2

Very slightly included 2

SI1+

Slightly better than SI1

SI1

Slightly included 1

SI2+

Slightly better than SI2

SI2

Slightly included 2

I1+

Slightly better than I1

I1

Included 1

I1-

Slightly lower than I1

12+

Slightly better than I2

I2

Included I2

I2-

Slightly lower than I2

I3+

Slightly better than I3

I3

Included I3

I4+

Slightly better than I4

I4

Included I4

 

 

 

• if

internally flawless

• VVS1   VVS2

very very slightly included

• VS1   VS2

very slightly included

• si1   si2

slightly included

• i1   i2   i3   i4

imperfect

 

DIAMOND MEASUREMENT

 

Diamond cut

 

excellent

very good

good

fair

 

symmetry

Symmetry refers to the exactness of the shape and arrangement of facets and can be affected by the following factors:

off-round

Deviation from the circular shape of a round diamond.

off-center: culet

Deviation from the culet from the central position on the pavilion.

girdle thickness variation

Variation of the girdle thickness at the bezel positions.

 

off-center table

Deviation of the table from the central position of the crown.

table/ culet alignment

Displacement of the table facet and culet in opposite directions.

table size variation

Differing table size measurements indicating non-octagonal table.

 

Based on the factors above, we grade symmetry Under 10 X magnification as follows:

 

EX

Excellent Symmetry

VG

Very Good Symmetry

GD

Good Symmetry

FR

Fair Symmetry

 

POLISH

Polish is a measure of the smoothness of the facets on the Diamond and can be affected by any of the following:

abrasion

scratches

burn marks

 

nicknick

polishing lines

 

Other features which affect polish are:

Pit, Transparent Polishing Lines, Dop Burn, Rough Girdle, Laser Groove.

 

We grade the polish finish (Under 10 X magnification) with the following criteria:

 

EX

Excellent Polish

VG

Very Good Polish

GD

Good Polish

FR

Fair Polish

 

HEARTS & ARROWS

 

diagram 1

(Heart Image)

diagram 2

(Arrow Image)

 

 

The term Hearts and Arrows relates to a stone having perfect proportions and symmetry. When perfectly polished, the diamond displays Heart shaped reflections when looking from the Pavilion (Diagram 1) and Arrow shaped reflections when looking from the Table (Diagram 2)

 

Based on the factors above, we grade Heart & Arrow as follow:

 

ID

Ideal Hearts & Arrows

EX

Excellent Hearts & Arrows

VG

Very Good Hearts & Arrows

 

FLOURESCENCE

To measure fluorescence diamonds are exposed to ultraviolet light. This light will indicate the extent of fluorescence in Diamond. The pictures below show the different grades of fluorescence. We grade fluorescence by Comparing with fluorescence masters for accurate results

 

Star Rays Grades Fluorescence with UV light and Compare with fluorescence master Stones for accurate results.

 

N

None

F / VSL

Faint / V.Slight

M / SL

Medium / Slight

STG

Strong

V.STG

Very Strong

 

LUSTER

Luster is a way of measuring how the light interacts with the surface of the stone.
We use our experienced in house gemologists to assess the degree of luster.
When a stone has a cloudy effect, we grade this with the term Milky luster.

 

We grade under as follows:

 

EX

Excellent Luster

VG

Very Good Luster

ML - 01

(ML-01) Minor Milky Luster

ML - 1

(ML-1) Slight Milky Luster

ML - 2

(ML-2) Medium Milky Luster

ML - 3

(ML-3) Heavy Milky Luster

 

OPENS

Open is a very small unpolished section of a diamond which affects its polished finish. Opens can be Nick, Cavity or Percussion mark, knot, Etch Channel, Bruise & pit. When grading Diamonds we define an Open according to where it is located on the Diamond. It can be on the Table, Crown, Girdle or Pavilion.

The different facets of a round brilliant cut diamond

 

We grade opens as follows:

 

N

None

V.S

V.Small

S

Small

MED

(Medium

L

Large

 

INCLUSION PATTERN

The inclusion pattern defines the extent and proportion of inclusions in the diamonds. The grading criteria range from minor inclusions (scattered) to major inclusions (high concentration)

 

NA

Not Applicable

NC

Not Concentrated

S1

Scattered 1

S2

Scattered 2

C1

Concentrated 1

C2

Concentrated 2

C3

Concentrated 3

 

 

 

NA

NC

S1

S2

C1

C2

C3

 

CULET

A polished diamond has 57 facets and the Culet (the tiny facet or point at the base of the pavilion) The culet may vary in size that in turn can impact the brilliance of the polished stone, so we grade the Culet from Pointed (excellent) to chipped.

 

N

None

V.S

Very Small

S

Small

MED

Medium

 

 

 

None

V.Small

Small

Medium

 

BLACK INCLUSION

Natts are black colored crystals, graphite or hematite within a diamond. Higher the number of Natts inclusions within a diamond greater is its impact on the clarity and luster. We grade Natts according to its concentration, position and size.

 

	Black in Table (BIT)	Black in Crown (BIC)
NO Black	N0	N0
Minor Black	N01	N01
Small Black	N1	N1
Medium Black	N2	N2
Major Black	N3	N3

 

 

 

NO

NO1

N1

N2

N3

 

TABLE & CROWN INCLUSION

A diamond is graded by looking through the top (the Table), where it is possible to obtain the complete picture of its clarity. We grade diamonds on this basis to identify Table and Crown inclusion.

 

T01-C01

T2-C1

 

 

 

	Table Inclusion
T0	Clean Table
T01	Minor Inclusions
T1	V. Slight Inclusions
T2	Slight Inclusions
T3	Medium Inclusions
T4	Heavy Inclusions

	Crown Inclusion
C0	Clean Table
C01	Minor Inclusions
C1	V. Slight Inclusions
C2	Slight Inclusions
C3	Medium Inclusions
C4	Heavy Inclusions

 

 

For example: A low number of inclusions is graded as 0, and high number of inclusions is graded as 4.