Diamond value depends on the '4 Cs': cut, color, clarity and carat weight.
Any diamond is worth whatever someone will pay you for it. Today, on Blue Nile, you can purchase a diamond of this carat weight and pay between US$13,815 and US$68,676, depending on the cut, colour, clarity and exact carat weight that you want. Best practices dictate that if you own a diamond of this carat weight, that you pay a certified gemologist to document the characteristics of the diamond, in order to guide you in establishing a fair price for it.
Any diamond is 'worth' what someone will pay you for it. If you have such a diamond, best practices dictate that you pay a certified gemologist for a certificate describing and valuing the gem. You can purchase a diamond of this weight, colour and clarity grade, depending on the cut and pay from US$24,800 to US$30,700.
4 - cut, colour, clarity and carat
The ratings for diamonds are determined by 5 different things. The diamond cut, clarity, color, weight and finally the diamond certificate which lists all the unique individual characteristics.
In grading a diamond's clarity, VS indicates Very Slight.
Clarity H-I sounds more like the colour grade. Clarity I2-i3 means that there are two or three visible inclusions in the diamond. This is the lowest clarity grade for gem-stone quality diamonds.
"The clarity of the diamond tells you how clear the diamond is"
Clarity of a diamond is an ANSII standardized procedure that involves placing a light near the diamond and measuring the refraction.
You can review the charts and information, below, to learn more about diamond clarity symbols.
For a diamond, FL, or flawless, is the highest grade for clarity -- it is perfection for the stone in terms of its clarity.
AAA clarity is not a recognized rating for diamonds. The standard clarity scale for diamonds ranges from Flawless (no inclusions) to Included (visible inclusions). AAA is not a term used in the diamond industry to describe clarity.
You can have the clarity of a Diamond assessed at a Jewellers, often the item may be needed to be sent away. With an Enhanced diamond the diamond has been treated to achieve a better clarity than it originally had.
Trained gemologists use a 10x magnification to identify diamond clarity. You can read more about how clarity is graded by understanding the flaws and how they occur, below.
If by 'you' you mean 'U', and you're query is about clarity and not colour, it is possible that 'U' indicates unenhanced. Unenhanced diamonds are more valuable than enhanced diamonds.
SI2 clarity means slightly included. This is a grade used to describe diamonds with noticeable inclusions that are visible under 10x magnification, but may not be easily visible to the naked eye. It is a good balance between quality and cost for those seeking a diamond with some inclusions that do not greatly affect its beauty.
The clarity of that diamond, in the ring you are wearing, is remarkable!