SIDERO - MASALSI TAKILAR - Terimler

4c is the most important among the jewellery terms that appear during your jewellery shopping in our site. It should be paid great attention for these terms are since they are the factors that determine the quality and accordingly the price of the diamonds. 4C will give you preliminary and brief information about how the diamonds are graded and priced. Price difference of two diamonds at the same carat weight depends upon the characteristics of 4C and composition of these factors. These are effective on the price evaluation of the jewellery; however the factors such as design, workmanship and services are the other elements that constitute the final price.

CARAT:
Carat is a weight measure for a diamond (1 gram is approximately 5 carats) and indicated with “ct”, and in some places you may encounter with “tcw” phraseology. Such phraseology is used as the abbreviation for total carat weight and gives the total weight of the stone/stones on the jewellery. Since the specific gravities of the stones are different whereas diameter of a perfect circular cut diamond which is at 1 ct weight has a value such as 6.5 millimeters, the diameter (size) of a sapphire, ruby or emerald with the same cut will not be same. From time to time you may encounter with a definition such as 100 points (100 pt.). If it is required to give examples:

1pt	=	1/100	=	0.01ct
5pt	=	1/20	=	0.05ct
10pt	=	1/10	=	0.10ct
20pt	=	1/5	=	0.20ct
25pt	=	1/4	=	0.25ct
50pt	=	1/2	=	0.50ct

CUT:
Cut is a factor in which human factor comes on the forefront when the diamonds are classified. Whereas all the other factors are fully dependant on nature, high or low quality of the diamond on cut process is under human initiative compared to the impact of nature, and cut process will be the open point of jewellery at any time for further development in order to provide the jewellery to blaze more light.
Following particular points will be checked while classifying cuts.
The brilliancy of the light reflected by the diamond (blaze), this is the basic factor which causes diamond to blaze
Design of the diamond and appropriateness of cut and size proportions, solidity of stone
Symmetry and shine of the diamond, it indicates the skillfulness of the jewellery master

Cut of the diamond and shape of the diamond should clearly be distinguished from each other. Shape is dependant upon person’s preference. Circular cut is the most popular cut among the known cuts.

CLARITY:
Clarity of the diamond shall be graded as shown in the chart below in accordance with the findings reached as a result of examination made under appropriate lightning by a 10x lens.

COLOR:
Diamonds are graded according to how close they are to colorless. Appropriate lightning is a must in order to find out the real color of the diamond. Consequently, for this master stones and high Kelvin white lightning are required, otherwise it is almost impossible to determine the grades of the diamonds as their qualities get higher.

In the tables hereinabove the grading terms pertaining to GIA and AGS laboratories (indicated in black color) and the terms that we use (indicated in red color) in our site are presented.

COLORED STONE GRADING

CLARITY
Type I These are gems that grow extremely clean in nature and usually have no eye-visible inclusions. An example is Aquamarine.
Type II These are gems that typically grow with some minor inclusions in nature and the inclusions may be eye-visible. An example is ruby.
Type III These are gems that typically grow with many inclusions in nature and the inclusions are usually eye-visible. An example is emerald.

GIA GRADES	Severely Included	Heavily Included	Good	Fine	Extra Fine
Type I	Inclusions are prominent and have a severe effect on appearance, durability, or both.	Inclusions are prominent and ha a negative effect on appearance or durability.	Minor inclusions somewhat easy o see with the unaided eye.	Minute inclusions difficult to see with the unaided eye.	The stone appears clean to the unaided eye.
Type II	Inclusions are prominent and have a severe effect on appearance, durability, or both.	Inclusions are prominent and ha a negative effect on appearance or durability.	Noticeable inclusions apparent to the unaided eye.	Minor inclusions somewhat easy to see with the unaided eye.	The stone appears clean to the unaided eye.
Type III	Inclusions are prominent and have a severe effect on appearance, durability, or both.	Inclusions are prominent and ha a negative effect on appearance or durability.	Obvious inclusions very apparent to the unaided eye.	Noticeable inclusions apparent to the unaided eye.	The stone appears clean to the unaided eye.

HUE

Basic colors used for the purposes of color classification of the colored stones are presented below. 7 sub colors are also used as sub category starting from S1 to S7. The “Munsell Color System” developed by Albert H. Munsell is utilized in order to perform classification.

Color

Code

Name

red

orangy red

RO/OR

red-orange or orange-red

reddish orange

orange

yellowish orange

orangy yellow

yellow

greenish yellow

YG/GY

yellow-green or green-yellow

styG

strongly yellowish green

yellowish green

slyG

slightly yellowish green

green

vslbG

very slightly bluish green

bluish green

vstbG

very strongly bluish green

GB/BG

green-blue or blue-green

vstgB

very strongly greenish blue

vslgB

very slightly greenish blue

blue

violetish blue

bluish violet

violet

bluish purple

purple

reddish purple

RP/PR

red-purple or purple-red

stpR

strongly purplish red

slpR

slightly purplish red

red

pink (exception)

Brn

brown (exception)

TONE

11 descriptions from 0 to 10 are used in order to define either lightness or darkness of the colors.

Tone

Code

Name

Colorless or White

exl

Extremely light

Very light

Light

Medium light

Medium

Medium dark

Dark

Very dark

exd

Extremelt dark

Black

Tone Scale

1 2 3 4 5 6 7 8 9 10

SATURATION

6 different terms are used in order to describe the saturation and gleam of the color. Saturation and gleam (sparkling) of the stone is directly affected by the light permeability and cut of the mineral.

Scale

Code

Name

gr(br)

grayish (brownish)

slgr

slightly grayish(brownish)

vslgr

very slightly grayish(brownish)

mst

moderately strong

strong

vivid

Saturation scale (medium dark stone)

1 2 3 4 5 6

Munsell Color System

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Munsell Color System (Software)