According to Wikipedia:
"Slightly Included category (SI) diamonds have noticeable inclusions that are easy to very easy for a trained grader to see when viewed under 10x magnification.[2] The SI category is divided into two grades; SI1 denotes a higher clarity grade than SI2. These may or may not be noticeable to the naked eye."
"Good" is relative. From an investment point of view, SI is not as good as the less included clarity ratings.
The initials SI mean slightly included. This grade is near the lower end of the clarity scale for a diamond. You can read more about clarity grades, below.
The clarity grade of a diamond is determined by the number, and visibility, of its natural inclusions. Diamond clarity is rated using a 10x loupe, as a standard.Inclusions exist inside a diamond, or on its surface, and may be present in various forms, which include:pinpoints (white dots)carbon (black dots)feathersbubblescrystalscracksscratcheschipsYou can read more about diamond clarity, below.
The term "SI" indicates a clarity category, not a colour category. For clarity, "SI" indicates slightly included, and is usually followed by a number, 1, 2, or 3. In this scale, fewer is better.
A diamond is valued by its cut, clarity, carat weight and colour.
Every diamond is rated by its colour and clarity differently, along grades for each measurement. Tiffany and Company will gladly provide you with certificates that detail the colour and clarity -- and carat weight and cut -- of any diamond you purchase from them.
The initials SI mean slightly included. This grade is near the lower end of the clarity scale for a diamond. You can read more about clarity grades, below.
If we select the popular cut which is round, then a 1 carat round cut diamond of H color and SI1 clarity will cost approximately $4129. You can visit www.dubaiwholesalediamonds.com/diamond-searchfor more options.
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.
Every diamond is worth what someone will pay you for it. You can purchase a diamond of this weight and clarity today from Blue Nile and pay between US$1,283 and US$1,617, depending on the cut, exact weight and refined clarity.
"The clarity of the diamond tells you how clear the diamond is"
Any diamond is 'good' when it can be certified as to its characteristics: cut, colour, carat weight and clarity. A certified gemologist can perform this work for you.
The annotation 'AAA' is not a typical clarity notation for a gem-quality diamond.
The U colour is in the clearly yellow range of 'colourless' diamonds, and SI 2 is toward the lower end of desirability in terms of clarity. Today, at Blue Nile, the 'yellowest' diamond you can buy in the .65 carat price range is J colour, and with the clarity option you want, you'll spend about US$1,000.00.
For diamond Cut- round/ brilliant color= D, E, F clarity= Fl, IF or VVS1
Clarity of a diamond is an ANSII standardized procedure that involves placing a light near the diamond and measuring the refraction.
A GIA round 3 carat F color, VVS2 clarity diamond can cost about $56,900 and 3 carat round H color, SI2 (100% eye clean) clarity diamond costs about $25,951. You can select a good quality diamond if you focus on the cut and compromise on the clarity, depending on your budget.
SI2 indicates that in at least two places inside the diamond, inclusions, however slight, are visible.You can view diamond clarity images, below, including one for a diamond graded as SI2.