Gem Description

Amethyst 

Cut

square 

Weight in Carat

 4.46ct

Size

8mm by 6mm 

Clarity

VVS 

Source

Africa 

Treatment

Gentle Heat only 

Empirical Formula

Si02 

Hardness  Mohs

(10 is diamond and 1 in Talc/soapstone)

7 

Refractive Index

1.554-1.553 

Guide to Gem Grading

From the Gemmological Association of America GIA

FL

Loupe clean

Shows no inclusions or blemishes under 10 x magnification

IF

Loupe clean

Shows no inclusions and only insignificant surface blemishes

VVS

Very,Very small

inclusions

Contains minute inclusions that are difficult for an experienced grader to locate at 10 x magnification.

VVS1

As above

Inclusions are extremely difficult to see under 10 x magnification

VVS2

As above

Inclusions are difficult to see under 10 x magnification

VS

Very slightly included

Contains minor inclusions under 10 x magnification.  Small crystals, feathers and clouds are typical.

VS1

As above

Inclusions that are not easy to see

VS2

As above

Inclusions that a little easier to see than above

SI

Slightly included

Noticeable inclusions under 10 x magnification and to a trained eye

SI1

As above

Inclusions are easy to see under 10 x magnification and becoming more obvious to the naked eye

SI2

As above

Inclusions easier to see than SI1

I

Imperfect/Included

Contains obvious inclusions

I1/I2/I3

Imperfect

Graded downwards as to how much the inclusions affect the beauty of the gemstone

Weight Guide

1 Carat     = 0.2 Gram  

5 Carat     = 1.0 Gram

Each Carat is divided into 100 Points (pt) so:

1      Carat = 100 Points