The distinction between SI1 and VS2 diamonds is theoretically that SI1 diamonds are more included than VS2 diamonds. However, a SI1 diamond may be a better choice than a VS2 diamond since the imperfections are less visible or are in a location masked by your setting or the prongs holding it. Jadeite is the rarer and harder of the two minerals generally known as jade. The most valuable jadeite is the brilliant emerald-green jadeite known as "imperial jade."
SI1 refers to superior, ideal, flawless. This is the highest grade of diamond. It is also the most expensive. To qualify as SI1, a diamond must have no inclusions, no faults, and be completely free of any coloration. The abbreviation BV (for Brilliant Weight) is used to describe a perfect diamond that is 1 carat or larger. The word "brilliant" here means "having great clarity and color quality."
VS2 refers to very good, second best to ideal. A VS2 diamond has no flaws or inclusions that are more than one-quarter of a millimeter wide. It should also be noted that some diamond merchants may use the term "very good" to describe any diamond over.50 ct. If this practice is followed, then a.33ct diamond would be described as "very good," rather than "second best."
If you want a diamond that is ideal for someone on a budget, then consider using a VS2 diamond. They are available at many price points - from under $10,000 to well over $100,000!
A diamond with VS1 clarity has fewer and smaller inclusions than a diamond with VS2 clarity. In other words, a VS1 diamond is marginally superior to a VS2 diamond. The main difference between these two grades is that a VS1 diamond has visible flaws such as bubbles or voids inside the stone that are less than 1mm across. A VS2 diamond has larger inclusions which can be seen with the naked eye.
There are also some graded diamonds that are labeled "VS". These stones have many small inclusions that are difficult to see without a microscope. They may have one large inclusion that's clearly visible with the naked eye but most likely contain several smaller ones that can only be detected by a professional grading laboratory using x-ray diffraction (XRD) technology.
The number following the "VS" indicates the size of the largest inclusion that can be seen with the naked eye. A stone with a "VS" grade rating but containing a large inclusion that's greater than 2mm across will not be considered acceptable for retail sales. Finally, a stone with a "VT" rating means that it contains inclusions larger than 0.5mm but smaller than 1mm. VT diamonds are often called "fancy" stones because of their unique appearance.
The quality of your diamond is very important!
Price differences between VS1 and VVS2. Diamonds in the VVS2 clarity level are considered the finest value of the higher clarities—and they won't reduce the brightness of your diamond. VS1 diamonds, on the other hand, will cost less than VVS2 diamonds. However, because they are lower in quality, they will need to be re-graded periodically as wear causes their color rating to drop.
Color ratings for diamonds refer to the colors that appear when they are cut into stones for jewelry. There are three main color categories: white, yellow/brown, and red. Within those categories, there are many variations in color, from almost colorless to very dark red. The lab tests that rank diamonds by color grade look at a small section of each stone; therefore, two similar diamonds can have completely different grades.
The best way to understand how different diamond colors affect their appearance is to see them side by side on a mirror. The image below shows two diamonds of the same size and shape. One is rated "D" and the other is rated "E". Although they have the same letter grade, one is much more yellow than the other. The duller diamond will actually make your skin look greenish under black light, whereas the more vivid yellow diamond will cause your skin to look orange under black light.
As you can see, color affects how a diamond appears to the eye.
If you want to make the most of your diamond budget, choose a diamond rated SI or VS. Both of these diamond grades are clean to the human eye and have absolutely no discernible difference when compared. VS diamonds are classified as VS1 or VS2. SI diamonds are classified as SI1 or SI2. The higher the number, the more expensive the diamond.
There are many factors that go into determining the quality of any gemstone, including but not limited to: cut, color, clarity, weight, and setting. With diamonds, the grading system we use is that of the Gemological Institute of America (GIA). A GIA grader examines each diamond and gives it a grade between zero and 10, with 10 being the highest quality. Most diamonds fall in the six to eight range, with seven being mid-range and nine being top quality.
Although they are identical from a physical standpoint, some scientists believe that one diamond may be superior to another because it has greater beauty or brilliance when polished. These scientific differences can be seen only through laboratory testing. Today, synthetic diamonds are used instead, which are graded according to their quality and price tag. They come in two main types: cubic and pyroelectric. Cubic diamonds are formed by subjecting carbon gas to high temperatures for several hours, resulting in a diamond with its carbon atoms arranged in symmetrical cages.
Very, Very Slightly Included (VVS) diamonds have minute imperfections that are difficult to discern under 10x magnification for an experienced grader. When seen at 10x magnification, SI diamonds exhibit obvious inclusions that are easy or very simple for an experienced grader to spot.
The quality of diamond is shown by its clarity and color. There are three main types of diamond: clear, colored, and black. Clear diamonds do not show any color when viewed under a microscope. Colored diamonds may be red, pink, orange, yellow, or brown. Black diamonds are completely opaque to light.
The quality of clarity is also measured on a scale called the "clarity grade". These grades range from "F" for flawless down to "I" for inclusion. Diamonds are graded by size. Large, fancy diamonds are graded as follows: If the diamond is white or slightly gray, it is considered "good". If the diamond is completely black, it is considered "very good". If some gray areas are present, it is considered "great". Finally, if all of the surface is grayish-black, it is rated "excellent".
The clarity grade of a diamond is based on microscopic inspection of the stone's surface. Any visible blemishes on the diamond's surface will reduce its value. Clarity issues may include: cracks, nonuniform thickness, inclusions, and rough edges.