all about diamonds - ghi · 8 ghi gem lab (844.443.6522) info@ghigemlab.com © 2015 ghi. all...

8 GHI GEM LAB (844.443.6522)info@ghigemlab.comwww.ghigemlab.com

© 2015 GHI. All Rights Reserved.

CrownGirdle

Pavilion

Depth

Crown AnglePavilion Angle

TableDiameter

Culet

Fair Light Return (Too Shallow)

Fair Light Return (Too Deep)

PROPORTIONS

Very Good to Ideal Light Return

SHAPE

DEFColorless

GHIJNear Colorless

S-T U-VLight Yellow

W-X Y-ZLight Yellow

KLMFaint Yellow

N O-P Q-RVery Light Yellow

COLOR GRADE

DEFGHIJKLMNO-P Q-RS-T U-VW-X Y-Z

ColorlessNearColorless

FaintYellow

Very LightYellow

LightYellow

DEF

GHIJ

KLMN

O-P Q

-R

S-T U

-V

W-X

Y-Z

Color

less

Near

Color

less

Fain

t

Yello

w

Very

Ligh

t

Yello

w

Ligh

t

Yello

wDEF

GHIJ

KLMN

O-P Q

-R

S-T U

-V

W-X

Y-Z

Color

less

Near

Color

less

Fain

tYe

llow

Very

Ligh

tYe

llow

Ligh

tYe

llow

DEF GHIJ KLMN O-P Q-R S-T U-V W-X Y-Z

Colorless NearColorless

FaintYellow

Very LightYellow

LightYellow

DEF

GHIJ

KLMN

O-P Q-R

S-T U-V

W-X Y-Z

Colorless

Near

Colorless

Faint

Yellow

Very Light

Yellow

Light

Yellow

DEF

GHIJ

KLMN

O-P Q-R

S-T U-V

W-X Y-Z

Colorless

NearColorless

FaintYellow

Very LightYellow

LightYellow

CLARITY GRADE

Internally Flawless No visible inclusions at 10xmagnification; may have minor surface blemishes.

Very Very Slightly Included Very, very small inclusions; difficult to see at 10x magnification.

Very Slightly Included Very small inclusions; difficult to somewhat easy to see at 10x magnification.

Included Medium or large inclusions; obvious to the unaided eye.

Slightly Included Small inclusions; easy to see at 10x magnification or, at times, the unaided eye.

IF

VVS1

VS1

VVS2

VS2

SI2

I2

SI3

I3

SI1

I1

Carat 0.25 0.50 1.00 1.25 1.50 1.75 2.00 3.00Diameter (mm) 4.1 5.2 6.5 6.9 7.4 7.8 8.2 9.4Height (mm) 2.5 3.1 3.9 4.3 4.5 4.7 4.9 5.6

CARAT WEIGHT

Cushion

Pear

Emerald

Princess

Marquise

Radiant

Oval

Round

ALL ABOUT DIAMONDS