The system was developed for assessment of the clarity of the diamonds used in jewelry. While in the progress of development the clarity grading system was called 'diamond grading and evaluation appraisal'. The key aspects of the grading system were - color, clarity and make (quality of the cut, polish and finish).
Even though there were some other grading systems available for diamonds, there was no single system that was used as a standard across traders. Some of the classifications that were used before the formal development of the GIA clarity grading system were terms like Flawless, VVS, VS, SI and I.
But these terms of classifying diamonds were not very accurate and therefore was very arduous to use it practically in the trade.
In the early 1953, after the completion of the GIA clarity grading system, it was formally announced and made public.This initial system had nine grades and these included - Flawless, VVS1, VVS2, VS1, VS2, SI1, SI2, I1 and I2. The 'I' stood for Imperfect and was exactly the opposite of the Flawless diamond.
Though this new system of grading had been contributed to the industry, there was the need to popularise it. It required lot of practice and training to incorporated it fully into the trade.
In april 1953, Soon after revealing the GIA clarity grading sytem, the first diamond grading class was started by Liddicoat and Robert Crowningshield. The place of this first distinguished course was New York. With a modest beginning that attracted only about 11 students from Massachusetts and Pennsylvania, GIA clarity grading courses are held in various cities and this learning is disseminated using various teaching methods like distance education, traveling extension classes and probably webex too.
The system developed in 1953 underwent its first change only in 1970 when the IF grade was added to the already present nine grades. This was done because Liddicoat realized that many diamonds were re polished to get the Flawless certificate, compromising on the symmetry and the proportions. (IF grade means Internally Flawless where the diamond can have some blemishes from outside but has to be flawless internally.)
Minor changes have been made to the system since then but the GIA Clarity Grading System was the first attempt to professionalize any kind of diamond clarity grading system. The efforts by Liddicoat and team have led to a more objective classification of the diamonds that are traded today and therefore made the industry more structured.
Reference : GIA Study Material ( Graduate Gemologist )
High School Grading System
If you're in the market for hardwood floors but haven't yet decided whether to hire a hardwood floor contactor or do it yourself, then you might want to consider some of the following facts. Today you can find at least 50 species of trees, both domestic and exotic, available for your flooring needs. They come in a broad range of colors and hardness. Prices can vary from the low to the higher ranges.
A grading system has been developed by the Wood Flooring Manufacturers Association. It's used to determine the quality of unfinished hardwood flooring. It uses color, grain and marking as criteria. In the upper price ranges the most and often the best grades are marked "clear" and "select".
It seems that people in today's marketplace are looking for more natural appearing woods, those that show the knots and other more natural variations or even show the texture.
When you buy hardwood flooring planks you can take them home and finish them there or you can buy flooring that is already pre-finished. Pre-finished woods can cost you more but can save you money on labor. That's because it is easier to put the planks down and not as messy as installing the standard floor. If you do decide to buy them, be aware that pre-finished woods are not graded. Ask for a sample plank so you can take it home, lay it down and see how it will look. This way you will avoid making a big mistake and save yourself the agony of making a wrong decision besides saving you money if it doesn't work out the way you want it to.
To get an idea of what your hardwood flooring will cost from the most bargain prices to the most expensive - the lower end of less expensive flooring costs about $1 a square foot. Usually domestic red oak comes in 2 1/4 inch strips, has a lot of flaws and the boards come in various lengths. This type at this price you would have to finish yourself.
A step up from this is a high-grade red oak. This type if the most commonly used hardwood by both homeowners in the U.S. and builders alike. It costs about $5 a square foot.
If you can spend more money, say up to $10 per square foot, then you have much better choices. You can use wider planks and exotic or more expensive domestic hardwoods like American walnut. You can get three inch wide strips with a natural finish.
If you can afford to get the more expensive of both the domestic and exotic hardwoods, custom designs and even hand-scraped hardwood then you can get these in three, five or seven inch planks. Cost is about $20 per square foot.
If you prefer not to install your flooring yourself, you can hire a hardwood floor contractor and buy the unfinished flooring of your choice. Cost will vary depending on the contractor you choose. This type of skilled labor is very labor intensive. The result however will be exotic and will not have a standard-looking appearnace.
Regardless of your choice, whether you decide to hire a hardwood floor contractor or do it yourself, you won't be making a mistake by installing hardwood flooring in your home or office.
Both Mithun Rao & are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
Mithun Rao has sinced written about articles on various topics from Diamonds, Jewelry and Diamonds. Mithun Rao, a gemologist has an obsession for gems and precious stones since more than 10 years. He also shares a passion for music, painting and meditation. Apart from runnig his own jewelry store he owns and manages the site on. Mithun Rao's top article generates over 22200 views. to your Favourites.
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