| Type |
A |
B |
C |
D |
E |
| Colour Grade |
Top Colour |
Top to Medium |
Medium Colour |
Medium to Light |
Light Colour |
| Clarity Grade |
Loupe Clean |
Eye Clean |
Tiny Inclusion |
Many Inclusions |
Heavily Flawed |
| Lustre/Sparkle |
Excellent |
Very Good |
Good |
Acceptable |
Poor |
| Cutting Grade |
Perfect |
Excellent |
Very Good |
Good |
Acceptable |
| Colour Change (Alexandrite) |
80%-100% Colour Change |
60%-79% Colour Change |
40%-59% Colour Change |
20%-39% Colour Change |
0%-19% Colour Change |
Star Sapphires
/ Cats Eye |
Perfect Strong Star/ Eye |
Very Good Star / Eye |
Good Star/ Eye |
Acceptable Star/ Eye |
Poor to No Star/ Eye |
| Enhancement |
N (Natural/ Unheated) |
E (Assume Enhanced by Heat only) |
H (Mild Heated) |
T (Treated) |
U (Unknown) |
Colour Grade
A - The Gem has the best, evenly spread colour, hue, tone, & saturation.
B - The Gem is between A and C; medium-dark colour.
C - The Gem has a medium but still, very good colour.
D - The Gem is between C and E, and of light colour.
E - The Gem has a very light shade of colour (that nears white).
Clarity Grade
Gemstones are differently graded to Diamonds, as they are freely available in larger sizes unlike the larger Diamonds, inclusions are generally more noticeable and hence we have their clarity broken down into 5 grades to better mimic the well know diamond grading method: Loupe Clean/ A Grade (IF to VVS1), Eye Clean/ B Grade (VVS2 to VS2), and everything else C to E Grade (SI to HI).
A Grade (Inclusions not seen under a 10x Loupe)
A+ (FL/ Flawless) – The Gem is better than Loupe Clean (extremely rare), with no visible inclusions internally or externally.
A (IF/ Internally Flawless) -The Gem is Loupe Clean with absolutely no visible inclusions under a 10x lens/ loupe.
A- (VVS1/ Nearly IF) – The gem is nearly Loupe clean with a single, nearly invisible inclusion under a 10x lens/ loupe.
These are very rare & valuable Gems.
B Grade (Inclusions not seen with the naked eye)
B+ (VVS2/ Eye Clean) – The Gem is better than eye clean with a very few inclusions visible only under a 10x lens.
B (VS1/ Eye Clean) - The Gem is Eye Clean with no visible inclusions to the naked eye, and is excellent for investment/ collection/ setting.
B- (VS2/ Nearly Eye Clean) – The Gem is nearly Eye clean with a single near-invisible inclusion only visible to the naked eye upon close inspection.
Such Inclusions do not significantly affect the value of a gem.
C Grade (Inclusions not seen with the naked eye from 1 foot away)
C+ (SI1/ Slightly Included) - The Gem has one tiny inclusion that is visible only upon close inspection, but is not visible 1 foot away from the naked eye (seen at waist/ table height).
C (SI2/ Slightly Included 2) - The Gem has more than one inclusion that is not visible 1 foot away from the naked eye.
C- (SI3/ Slightly Included 3) – The Gem has more than one inclusion that is visible at 1 foot away from the naked eye.
Such Inclusions moderately affect the value of a gem.
D Grade (Inclusions seen with the naked eye from 1 foot away)
D+, D, D- (I/ Included) – The Gem has multiple inclusions that are visible to the naked eye from 1 foot away (table height).
Such Inclusions more than moderately affect the value of the gem.
E Grade (Inclusions seen with the naked eye from 3 feet away)
E+,E, E- (HI/ Highly Included) - The Gem has many visible inclusions that can be noticed from about 3 feet away or at arms length.
The value of the gem is significantly affected.
Shape/ Cut & Lustre
A+, A, A- (Excellent) - Ideal proportions and symmetry, excellent polishing, exceptional brilliance and lustre.
B+, B, B- (Very Good) - The Cut is very good but lacking one aspect of either symmetry, polishing, or luster and brilliance.
C+, C, C- (Good) - Balanced symmetrical form, minimal facet misalignment, small or almost invisible polishing marks, good lustre.
D+, D, D- (Acceptable) - The Cut is somewhere between C & E.
E+, E, E- (Poor) – More than one of the following: Unsymmetrical or disproportional form, evident facet misalignment, noticeable polishing marks, poor surface lustre, overly dark 'dead' stone.
Enhancement
We DO NOT sell treated gemstones - NO beryllium, glass filling, radiation, etc. - only Natural, earth-mined gemstones. Any enhancement is only of Mild Heat, which is a world-wide accepted enhancement that permanently increased the colour inside a stone, without the inclusion of any foreign/ artificial substances. These items are clearly indicated in the description table of each gemstone. We use four letters to indicate the enhancement of a gemstone:
N – Natural
The Gemstone has been certified (or known) to be Unheated and is 100% Natural. No enhancement of any sort has been done to the gemstone.
E – Assume Enhanced (by Mild heat only)
Since many enhancements are difficult or impractical to prove definitively, unless otherwise indicated, our approach is to assume that such enhancements have been applied to that particular gemstone. This assumption is made to protect both buyer and seller. The gemstone could either be unheated or have undergone Mild Heat treatment only (heated in low temperatures to mildly but permanently increase the colour of a gemstone). Obtaining a certificate (optional) can prove the existence of heat enhancement or otherwise.
H – Heated Only
The gem has been heated to permanently increase the colour in the stone. This practice is widely accepted throughout the world and does not alter the chemical composition of the stone. Furthermore, this does not affect the value of the stone (significantly) unlike in beryllium treated stones.
T - Treated
The gemstone has been treated in ways other than Mild heat. This significantly affects the value of the stone. We DO NOT sell treated stones under any circumstance.
Star Sapphire & Cats Eye Quality
A+, A, A- (Perfect) – There is a Strong, electric-bright (6 Ray) Star/ Eye that is clearly visible. There are no weak or broken rays.
B+, B, B- (Very Good) – The Star/ Eye is clearly seen brightly. One ray or tiny part of the eye may be weak or broken.
C+, C, C- (Good) – The Star/ Eye is clearly seen, and may be a little dull. Two rays or a small part of the eye may be weak or broken.
D+, D. D- (Acceptable) – The Star/ Eye is visible but not entirely. Three rays or a significant part of the eye may be weak or broken.
E+, E, E- (Poor) – The Star/ Eye cannot be seen very clearly or may not be visible at all. Four or more rays of the star or almost all of the Eye may be extremely weak and broken in many areas.