Diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.
Cut, Carat, Color and Clarity – are the universal language of the diamond. Understanding this language will help you understand your diamond.
The term “cut” has two references: One is the diamond’s shape, the other is the quality, determined by its proportions, symmetry and polish.
The top-selling diamond cut shape is the round brilliant. Other cut shapes including princess, marquise, pear, heart, oval, emerald, radiant, cushion are considered fancy cut.
The cut of a diamond is considered to be the most important factor with respect to its beauty. The cut determines the brilliance of the diamonds – how light is reflected, dispersed and scintillated. Unlike color and clarity, there is not a single grade that defines it. Furthermore, two diamonds equal in carat weight, color and clarity can differ in appearance and value because of differences in cut quality.
The cut is the most complicated of the 4Cs. Unlike carat weight, color and clarity, whose value and rarity are related to the diamond’s natural formation, cut quality is the result of human decision and diamond cutting skills.
There are three factors that determine a diamond’s cut quality:
- Proportions: the relative sizes and angles of the diamond’s parts and facets
- Symmetry: the precision of the cut design, especially the facets
- Polish: the smoothness and luster of the diamond’s surface
The cut grades are referenced on a diamond’s certificate often using the GIA standards of Excellent, Very Good, Good, Fair and Poor. For the most part, the actual measurements are mainly on the laboratory reports.
The quality of a diamond’s cut always speaks for itself.
Carat weight is the easiest to understand of the 4Cs. A diamond’s weight is measured in carats. The carat is subdivided into 100 equal parts called ‘points.’ One point equals .01 carat or 1/100 carat. A one carat diamond equals 100 points. Carat weight is written in decimal numbers, but it is frequently expressed in fractions which are easier to understand. Diamond weight fractions are approximate and refer to ranges of weight. This chart from The Diamond Council of America® is a handy reference:
Diamond prices increase with carat weight because larger diamonds are less common and more desirable. However, two diamonds of equal carat weight can have dramatically different values depending on three other factors: Color, Clarity and Cut. In jewelry pieces with more than one diamond, the carats are described in terms of total carat weight (T.W.). This is the combined total weight of all the diamonds in the piece. Determining the carat weight that is right for you depends primarily on your budget and taste.
choosing the right color for your diamond is based on personal preference. It’s important to remember that you are generally searching for a stone with little to no color.
Diamonds are colored when the crystals grow inside the earth. Tiny traces of some elements like nitrogen can color the crystals. In addition, the pressure involved in the diamond formation creates distortion in the crystal structure which is believed to also contribute to its color.
The color evaluation on gem-quality diamonds is based on the absence of color. The Gemological Institute of America (GIA) uses a 12-letter alphabetical scale of D to Z. Using this scale, the diamond on the lower end of the scale (D) will have the least amount of color – it is considered a colorless stone. The diamond at the higher end of the scale (Z) has deeper tones. However, when a diamond’s color is more intense than the “Z” grading, it enters the realm of a “Fancy Color” diamond. In this case, the intensity of the color in the diamond can play a significant role in its value. The value of a Fancy Colored Diamond can surpass that of colorless diamonds if the intensity of the color is high and the color is rare.
- D grade is absolutely colorless
- E and F are essentially colorless. The difference between D, E, and F is so slight that only experts can see it when the diamonds are not mounted.
- K, L, and M are faintly tinted. Diamonds under 1/2 carat appear colorless when mounted. Diamonds over 1/2 carat may show a tint of color.
- Grades N through Z have a light tint, and it is visible.
Diamonds with less color are more rare and valuable. Only about 5,000 of the polished diamonds produced each year weighing 1/2 carat or more are colorless. Most of the diamonds sold are grades G to L. For fancy diamonds, the value goes up with the intensity of the color.
Fancy colors include bright yellow, pink, champagne, blue and green. Red, purple and orange diamonds, though found in nature, are extremely rare.
How the diamond is set can make a difference in color too. Color is more important in rings than earrings and pendants because the diamond is usually larger.
- Putting a truly colorless diamond in a yellow gold setting will reflect on the stone causing a yellowish tint.
- Colorless and near-colorless diamonds come alive in a platinum or white gold setting.
- A slightly yellow-tinted diamond will appear whiter in a yellow gold setting. Keep in mind that color is only one of the 4Cs so even when a stone has a visible tint, it can still be very lovely when mixed with good clarity and cut.
Clarity is a measure of the tiny imperfections found in most every diamond.
A flawless diamond with little to no imperfections is often desired due to its rarity, but they are also the most costly. Therefore, it is important to keep in mind that it is very common for diamonds to be formed with slight imperfections.
These imperfections are known as “inclusions” and usually occur during the diamond’s crystallization period within the earth, or from the stresses of mining and processing. Inclusions are anything from tiny white points to dark dots, cracks or scratches. The fewer inclusions, the more valuable a stone is. Clarity is evaluated using a 10-power magnification. This means that the object viewed appears 10 times its actual size. The diamond grader examines the clarity characteristics with respect to the nature and number of characteristics, as well as their size, color and position. The clarity grade assigned reflects the degree of visibility of the characteristics.
The GIA Diamond Clarity Grade scale has five main categories of clarity characteristics with 11 grades in all.
The FL Grade (Flawless)
The term FL or flawless is used for diamonds in which a qualified observer, under favorable lighting conditions, cannot find internal characteristics and/or faults by thorough examination with a 10X loupe.
The IF Grade (Internally Flawless)
A diamond which has no internal characteristics but which, due to minor finish faults, is not flawless and therefore cannot be designated FL or flawless, may be called IF or internally flawless provided the finish faults are so minute that they can be removed by a gentle polishing with only an insignificant loss of weight.
The VVS Grades (Very, Very Small Inclusions)
The term VVS is used for diamonds with internal characteristics very, very difficult for a qualified observer to find under observation conditions as described. Further, there may only be insignificant finish faults.
The VS Grades (Very Small Inclusions)
The term VS is used for diamonds in which it is difficult for a qualified observer, under observation conditions as described, to find either a few somewhat larger internal characteristics or several very small ones.
The SI Grades (Small Inclusions)
The term SI is used for diamonds in which a qualified observer may, without difficulty, under observation conditions as described, find internal characteristics. Further, there may only occur single finish faults of an insignificant kind.
The term I or imperfect is used for diamonds in which a qualified observer, with the naked eye, can see internal characteristics and/or in which such major faults occur, which substantially reduce the value of the stone.
Only about 2% of the world’s diamonds are actually flawless. Most retail stores carry VVS as their highest grade. VS or SI are considered by most to be “fine quality” diamonds.
Diamonds often possess unique markings – either internal (known as inclusions) or external (known as blemishes). A diamond’s clarity grade depends on the absence or abundance of such inclusions and blemishes.
The following lists some commonly used terminology to describe a diamond’s internal and external characteristics:
External Flaws Internal Flaws
- Natural – unpolished surface,
the original ‘skin’ of rough diamond Cleavage or feather – inclusion along atomic grain
- Pit – small indentation on a flat surface Fracture – irregular shaped break
- Cavity – opening on surface Included – inclusions within diamond
- Nick – minor surface chip Carbon spot – included crystal
- Grain/twinning line – irregularity in crystal growth Pinpoint – small included crystal (appears white)
- Scratch – small groove (can be due to normal wear) Cloud – group of pinpoints
- Chip – broken along external edge Internal grain line – visible part of internal grain structure
- Laser drill hole – clarity enhancements to
remove/reduce appearance of inclusions
- Bearded or feathered girdle – minute to small
hairline fracture extending from girdle into stone
The clarity grade of a diamond not only affects the value and price, but can also be a good indication of the diamond’s vulnerability. Heavily included diamonds can be prone to breakage.
We like to believe there is actually a fifth C: Care
Taking care of your diamond jewelry keeps the diamonds looking their best and prevents them from being lost or damaged.
A regular, professional cleaning is recommended, usually every six months. Diamond jewelry can easily acquire a buildup of dirt, make-up and other materials that can diminish brightness, especially if it is worn every day.
Where Does The Term Diamond Come From?
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