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Gemstone Facts

Every gemstone is distinct in terms of hue, color grades, clarity, hardness, cut, tone and saturation. To understand the difference, several parameters are used by GIA (Gemological Institute of America) to distinguish between gemstones. GIA reports represent the highest standard of reliability, consistency and integrity.

Precious & Semi Precious Gemstone Facts

Amethyst


Diamond


Garnet


Sapphire

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GIA Color Grade Scale



Abbreviation

Hue

Abbreviation

Hue

P

Purple

styG

strongly yellowish-Green

rP

reddish-Purple

yG

yellowish-Green

RP/PR

Red-Purple or Purple-Red

slyG

slightly yellowish-Green

stpR

strongly purplish-Red

G

Green

More About GIA Color Grade Scale

 

GIA Tone And Saturation Scale



GIA Tone Scale



0

1

2

3

4

Colorless or White

Extremely Light

Very Light

Light

Medium-Light

 

GIA Saturation Scale

1

2

3

4

5

6

Brownish or Grayish

slightly Brownish or slightly Grayish

very slightly Brownish or very slightly Grayish

Moderately Strong

Strong

Vivid

More About Gem Tone and Saturation Scale

 

Colorless Gem Grading Scale

Color

GIA

CIBJO

Colorless

D

Exceptional white+

E

Exceptional white

F

Rare white+

Near Colorless

G

Rare white

H

White

I

Very slightly tinted white

J

Slightly tinted white

More About Colorless Gem Grading Scale

 

GIA Clarity Grades

Type I Clarity Scale

Exceptional

Very Good

Good

Fair

Poor

VVS

VS

SI

I1... I2

I3

Very Very Slightly Included

Very Slightly Included

Slightly Included

Included

Excessively Included

More About GIA Clarity Grade Scale



Type I Clarity Scale



Type II Clarity Scale



Type III Clarity Scale



Gem Hardness

MOH's 
Hardness

Mineral used for comparison

Simple Hardness

Cutting Hardness
(A. Rosiwal)

10

Diamond

 

140,000.00

9

Ruby

,

Sapphire

,

Alexandrite

,

Chrysoberyl

 

1,000.00

8

Aquamarine

,

Emerald

,

Morganite

,

Spinel

,

Topaz

 

175.00

7

Amethyst

,

Citrine

,

Garnet

,

Iolite,

Kunzite

,

Peridot

,

Tanzanite

,

Tourmaline

,

Zircon

Scratches window glass

120.00

Learn More About Gem Hardness

 

Gem Cut

 

Brilliant Full Cut

Eight Cut

Rose

Half Dutch Rose

Learn More About Gem Cut

NOVEMBER BIRTHSTONE - CITRINE


Citrine Gemstone

COMMEMORATIVE EVENT - 13th Anniversary
KEYWORDS - Success, Abundance, Personal Power
ALSO KNOWN AS - Merchant's stone, Success stone
COLORS - Pale yellow to brown
OCCURRENCE - Brazil
COLOR ZONING - Tiger stripes or Zebra stripes

Find Your Lucky Number and Stones through your Birth date

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