GIA Colored Stone Grading System.

This is the Gem Institute of America's colored stone grading system. I have been told by GIA gemologists that this system is still being modified and worked on by them. I have listed this system because it is being used by GIA gemologists (of course) and some others in the gemstone industry. If you are buying GIA certified stones, chances are you will encounter this system.

Be careful and read the clarity definitions between the three "Type Categories". They are different even though the clarity letters are the same (VS, VVS, SI1).

Notice that there are different "Types" for the same families of gemstones. For example Tourmaline is in several "Types".

Note: That the GIA system does not have an "IF" clarity grade for colored gemstones.

I personally do not agree with this and think there should be an "IF" grade. In my opinion this smells like politics to me. I have been quite vocal about it to several GIA people that I know. We agree to disagree.

I think by not having an "IF" category they are lowering the grade of all colored gemstones. Their argument/excuse is that by looking in a microscope they can always find a spot, crystal growth, included crystal, or whatever, if they look long enough. This is true of any gemstone if you look long enough and with enough magnification.

But the standard has always been (and will be) that if an "expert" cannot see any inclusions/flaws under a 10x power loupe the stones are judged to be "IF" (internally flawless).

My personal opinion is that there are some gemstones that are exceptional and they need to be graded that way. Not lumped in with everything else and graded a lower clarity grade to make the lower clarity material look better. When a stone is exceptional it should be graded that way.

I do not use this system for grading my colored stones with the exception of an occasional stone that I have had certified by a GIA gemologist.

I do not like GIA's system and think it's confusing to customers and frankly in my opinion leaves a lot of loose ends for unethical people to operate in. This is my personal opinion. This system is being used commercially so I have posted it for informational purposes.

I think there are a lot of things going on in this grading system that I have not mentioned. Read through it and draw your own conclusions.

Type I - Gemstones Beryl Aquamarine Green Morganite Yellow Chrysoberyl Green Yellow Quartz Smokey Spodumene Kunzite Green Topaz Blue Yellow Orange Pink Red Tourmaline Green Zircon Blue Zoisite Tanzanite

Type I - Clarity VVS - Very, Very Slightly Included (the best) Minute inclusions that are difficult to see using 10X, and are not visible at all to the naked eye. VS - Very Slightly Included Minor inclusions that are easier to see using 10X, but still not visible to the naked eye. SI1 - Slightly Included I The inclusions are easily seen using 10X, and are noticeable with the naked eye. SI2 - Slightly Included 2 The inclusions are more easily seen using 10X, and are quite visible with the naked eye. I1 - Included 1 The inclusions are very obvious and they have a moderate negative effect on the over-all appearance or durability of the gemstone. I2 - Included 2 The inclusions are very obvious and they have a severe negative effect on the over-all appearance or durability of the gemstone. I3 - Included 3 The inclusions are very obvious and they have a sever negative effect on both the over-all appearance and durability of the gemstone.

Type 2- Gemstones Andalusite All Chrysoberyl Alexandrite Corundum All colors (i.e. Sapphire and Ruby) Garnet All species and colors Iolite - All Peridot - All Quartz Amethyst Citrine Ametrine Spinel - All Tourmaline Blue Orange Yellow Multi-colored (except watermelon color) Zircon Green Orange Red Yellow

Type 2 - Clarity VVS - Very, Very Slightly Included (the best) Minor inclusions that are somewhat easy to see using 10X, but still not visible to the naked eye. VS - Very Slightly Included Noticeable inclusions that are easier to see using 10X, and may be slightly visible to the naked eye. SI1 - Slightly Included I The inclusions are easily seen using 10X and are large or numerous, and are noticeable with the naked eye. SI2 - Slightly Included 2 The inclusions are easily seen using 10X and are large or numerous, and are very noticeable with the naked eye. I1 - Included 1 The inclusions are very obvious and they have a moderate negative effect on the over-all appearance or durability of the gemstone. I2 - Included 2 The inclusions are very obvious and they have a severe negative effect on the over-all appearance or durability of the gemstone. I3 - Included 3 The inclusions are very obvious and they have a sever negative effect on both the over-all appearance and durability of the gemstone.

 

Type 3 - Gemstones Beryl Emerald Tourmaline Red Pink Watermelon (green transitioning to pink or red)

Type 3- Clarity VVS - Very, Very Slightly Included (the best) Noticeable inclusions that are easy to see using 10X, but usually not visible to the naked eye. VS - Very Slightly Included Obvious inclusions that are easy to see using 10X, and usually visible to the naked eye. SI1 - Slightly Included I The inclusions are large and numerous using 10X, and prominent with the naked eye. SI2 - Slightly Included 2 The inclusions are large and numerous using 10X, and very prominent with the naked eye. I1 - Included 1 The inclusions are very obvious and they have a moderate negative effect on the over-all appearance or durability of the gemstone. I2 - Included 2 The inclusions are very obvious and they have a severe negative effect on the over-all appearance or durability of the gemstone. I3 - Included 3 The inclusions are very obvious and they have a sever negative effect on both the over-all appearance and durability of the gemstone.