The acronym I2 insofar as diamonds are concerned is the least desirable category of clarity. From Wikipedia:
"Includedcategory (I) diamonds have obvious inclusions that are clearly visible to a trained grader under 10x magnification. Included diamonds have inclusions that are usually visible without magnification or have inclusions that threaten the durability of the stone.
"The I category is divided into three grades; I1 denotes a higher clarity grade than I2, which in turn is higher than I3. Inclusions in I1 diamonds often are seen to the unaided eye. I2 inclusions are easily seen, while I3 diamonds have large and extremely easy to see inclusions that typically impact the brilliance of the diamond, as well as having inclusions that are often likely to threaten the structure of the diamond."
Diamonds are graded based on the 4 C’s, which are cut, carat, clarity and color. Clarity measures how clean a diamond is from inclusions. The grading for clarity ranges from FL – flawless, IF – internally flawless, VVS1’2 – very very slightly included, VS1’2 – very slightly included and SI1, SI2 – slightly included. I1 clarity inclusions are even more obvious and clearly seen than SI2 clarity inclusions. Most I1, I2 and I3 inclusions are visible to the naked eye.
One can assume that clarity I2 is what you mean, instead of 12 -- 'eye two' not 'one two'. A diamond with clarity I2 means that there are multiple inclusions or flaws that are visible to the naked -- unmagnified -- eye. The I stands for Included and the number represents the degree to which is it included. I1 being the least to I3 being the most.
Clarity for a diamond describes the number and amount of flaws or inclusions in a stone. Perfect clarity -- the lack of any flaws or inclusions -- is called Flawless, or Internally Flawless, which is the highest clarity grade.
Colour, cut, clarity, and carrot
Champagne diamonds are not as expensive as diamonds with less colour, when comparing both of similar cut, similar carat weight and similar clarity.
Diamonds are classified as industrial -- about 80% -- and gemstone quality, the remainder. Gemstone quality diamonds are classified according to cut, clarity, colour and carat weight.
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.
One can assume that clarity I2 is what you mean, instead of 12 -- 'eye two' not 'one two'. A diamond with clarity I2 means that there are multiple inclusions or flaws that are visible to the naked -- unmagnified -- eye. The I stands for Included and the number represents the degree to which is it included. I1 being the least to I3 being the most.
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.
SI1 has the fewest and smallest inclusions, while SI2 has more and larger inclusions. This doesn't mean that SI clarity diamonds are a poor choice. In fact, most SI1 clarity diamonds will look just as good as a higher clarity diamond.
The clarity of the response required no further inquiry. Diamonds and wine are judged by their clarity.
Clarity is relative, some diamonds are hardly clear at all.
Clarity for a diamond describes the number and amount of flaws or inclusions in a stone. Perfect clarity -- the lack of any flaws or inclusions -- is called Flawless, or Internally Flawless, which is the highest clarity grade.
usually it the clarity ,color and cut of the diamond
Diamonds are rated according to the colour, clarity, carat weight and cut.
Cut diamonds are valued by their cut, clarity, carat weight and colour.
Clarity is measured visually and according to standards. You can review the guidelines, below.
For jewelry, the least expensive diamond has a more yellow colour (M-Z), is visibly flawed (I2+), poorly cut and hasn't much weight -- less than one carat. Given stones of the same carat weight, clarity and cut, brown diamonds are not as expensive as white diamonds and black diamonds are not as expensive as brown diamonds.