# Diamond Education

• Carat
•
Diamonds are measured in metric carat (ct), the standard unit of weight for diamonds, which equals 0.20 grams or 1/142 of an ounce. Carats are divided into points with each point representing 1/100th of a carat. A 1.00ct diamond is also represented as 100 points. A 0.75ct is also represented as 75 points. The most obvious distinguishing appeal of a diamond is the carat weight of it and it’s not the most important aspect in determining the value of a diamond, it may be the least important factor in some cases. The carat measures the actual weight of the diamond and not the size. Diamonds that are the same size may alter the exact carat weight. It is known that diamonds of the same proportion, a larger diamond would be more valuable then a smaller diamond.

A metric carat can be expressed in different measurements. For example, a one carat diamond can be expressed as:
• 1 carat
• 0.20 gram
• 1/5 gram
• 200 milligrams
• 100 points
• 4 grainer

The following table gives you an approximate guide to diamond sizes in millimeters (mm) with approximate carat weight. The numbers displayed under carat weight are approximate carat weights and the numbers displayed under the diamond shapes are approximate millimeters.

 Carat Weight Round Princess Emerald Oval Pear Marquise Heart Trillion 0.25 4.1 3.5 x 3.5 5 x 3 5 x 3 5.5 x 3.5 6 x 3 4 x 4 0.50 5.2 4.5 x 4.5 6 x 4 6 x 4 6 x 4 8 x 4 5 x 5 6 x 6 x 6 0.75 5.8 5 x 5 6.5 x 4.5 7 x 5 9 x 4.5 6 x 6 1.00 6.5 5.5 x 5.5 7 x 5 7 x 5 8 x 5 10 x 5 6.5 x 6.5 1.25 7.0 6 x 6 7.5 x 5.5 1.50 7.4 6.25 x 6.25 8.5 x 5.5 8 x 6 9 x 6 11 x 5.5 7 x 7 1.75 7.8 6.5 x 6.5 2.00 8.2 6.75 x 6.75 9 x 6.5 8.5 x 6.5 10 x 7 12 x 6 8 x 8 7 x 7 x 7 2.25 8.6 2.50 8.8 9 x 7 9 x 7 12 x 7 13 x 6.5 8.5 x 8.5 9 x 9 x 9 2.75 9.1 3.00 9.4 8 x 8 10 x 8 10 x 8 12 x 8 14 x 7 9 x 9 10 x 10 x 10 3.25 9.7 3.50 10.0 10 x 8.5 10x 8.5 13 x 8 14 x 7.5 9.5 x 9.5 3.75 10.2 4.00 10.4 11 x 9 11 x 9 14 x 8 16 x 8 10 x 10 4.25 10.6 4.50 10.8 11 x 9.5 14.5 x 9 10.5 x 10.5 4.75 11.0 5.00 11.2 12 x 10 12 x 10 15 x 9 16 x 8.5 11 x 11 5.25 11.4 5.50 11.6 5.75 11.75 6.00 11.9 6.25 12.1 7.00 12.5 7.50 12.85 7.75 13.0 8.00 13.1 8.25 13.27 8.50 13.4 8.75 13.5 9.00 13.65 9.75 14.0 10.25 14.4 12.00 15.0 13.00 15.45 14.50 16.0

If you have any further questions about carat weight, please send us an e-mail at inquiry@loosediamondexchange.com or call toll-free at 877-732-2387 and a diamond consultant can be of further assistant to you.

• Color
•
Diamonds are found in all colors. The finest diamonds are colorless; which make them rare and expensive. Beyond the preference for a colorless diamond, however, the color of a diamond does not affect its brightness or sparkle. The truth is, in some cases, when a good quality diamond is mounted in a setting, if there is any negative color aspects on that particular diamond, the setting will offset the negative color.
Diamonds are graded on a scale D- Z, D being the most desirable and Z being least desirable. The following are the color scale standards that GIA labs use:

(D-F) “colorless”, (G-J) “near colorless”, (K-M) “faint yellow”, (N-R) “very light yellow”, (S-W) “light yellow”, (X-Z) “fancy yellow”.

The following are the color scale standards that AGS labs use: (0-1) “colorless”, (1.5-3.0) “near colorless”, (3.5-4.5) “faint yellow”, (5.0-7.0) “very light yellow”, (7.5-9.5) “light yellow”, and (10) “fancy yellow”.

Listed below is a visual of GIA & AGS color grade chart:

### GIA

 D E F G H I J K L M N O P Q R S T U V W X Y Z Colorless Near Colorless Faint Yellow Very Light Yellow Light Yellow Yellow

### AGS

 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 Colorless Near Colorless Faint Yellow Very Light Yellow Light Yellow Yellow

GIA & AGS laboratories grade diamonds for color under certain, specific circumstances. GIA uses alphabets (D – Z) and AGS uses numeric (0 – 10) to determine a color grade for a specific diamond. The diamond must be loose, positioned in the correct posture, under the correct lightning and background, and viewed from the correct angle and distance. The diamond is also compared to a set of master stones and then issued either a letter or number for its color grade.

If you have any further questions about color grades, please send us an e-mail at inquiry@loosediamondexchange.com or call toll-free at 877-732-2387 and a diamond consultant can be of further assistant to you

• Clarity
•
The clarity refers to the existence of inclusions in a diamond. Each diamond contains a unique internal characteristic; which is also known as inclusion. Inclusions are natural identifying characteristics that are included within the diamond as they were formed in nature. Blemishes are inclusions that are external. When a diamond is being graded for its clarity under a 10X magnification, the size, nature of the inclusion, color of the inclusion, location, and quantity are taking into measure to determine which clarity grade that diamond will receive. The clarity of a diamond is rated using a scale that contains letters and numbers that clearly indicate which type of clarity rating that diamond will be assigned. Listed below is a clarity chart of GIA & AGS Laboratories.

### GIA Clarity Chart:

FL: Flawless
Free from internal and external flaws (very rare)

IF: Internally Flawless
Free from internal flaws, may contain external characteristics that can be easily polished out without affecting the diamond

VVS1: Very, Very Slight Inclusions
The table if free of inclusions and it’s very difficult to locate under 10X magnification

VVS2: Very, Very Slight Inclusions
Small imperfections located anywhere in the diamond

VS1: Very Slight Inclusions
The table is only allowed the smallest inclusions and small flaws throughout the rest of the diamond

VS2: Very Slight Inclusions
Very small internal flaws and small external imperfection

SI1: Slight Inclusions
Small internal flaws, eye clean diamond

SI2: Slight Inclusions
Small internal flaws which are detectable under a 10X magnification, could also be a eye clean diamond

I1: Inclusions
Flaws that can be detected easily under a 10X magnification and sometimes to the naked eye, difficult to see while observing with the naked eye in some cases

I2: Inclusions
Enormous and a lot of flaws, can be detected by the naked eye

I3: Inclusions
Enormous and a lot of flaws, can easily be detected by the naked eye

### AGS Clarity Chart:

0 => Flawless / Internal Flawless (FL/IF)

1 => Very, Very Slight Inclusions (VVS1)

2 => Very, Very Slight Inclusions (VVS2)

3 => Very Slight Inclusions (VS1)

4 => Very Slight Inclusions (VS2)

5 => Slight Inclusions (SI1)

6 => Slight Inclusions (SI2)

7 => Inclusions (I1)

8 => Inclusions (I2)

9 => Inclusions (I2)

10 => Inclusions (I3)

*GIA & AGS laboratories have professional diamond graders that grade the diamond for its clarity; there are approximately a minimum of two diamond graders that grade and examine the diamond. The diamond is carefully examined by professionals and we here at Star Facets respect GIA & AGS diamond graders. The clarity of the diamond has a little or no effect of the overall appearance of a diamond. The only time you have to start to worry about the look and clarity of the diamond is when you start searching diamonds in the lower grades, I1 and lower. What makes the diamond beautiful is the way the diamond was cut.

If you have any further questions about clarity, please send us an e-mail at inquiry@loosediamondexchange.com or call toll-free at 877-732-2387 and a diamond consultant can be of further assistant to you.

• Cut
•
A major characteristic among consumers today is how a diamond is cut; how does the diamond of choice appear? To determine how a diamond is proportioned to allow the most brilliance takes a lot of information and understanding. The cut of the diamond is considered one of the most important factors when determining which diamond to choose. The proportion and finish of a diamond is what determines the sparkle of it, the cut, which also refers to the shape of the diamond. The beauty of a diamond is how well of a sparkle it gives out, the way the light enters the diamond and how much of that same light returns back to your eye.

Diamonds come in all shapes or form, ideal cut diamonds are the best. At loosediamondexchange.com, we offer round cut brilliant, princess cut, emerald cut, radiant cut, oval cut, pear cut, marquise cut, heart cut, asscher cut, cushion cut and trillion cut diamonds. Shop today for your cheap, round cut, princess cut, cushion cut or any diamond cut of your choice at loosediamondexchange.com.

Listed below are illustrations of how light is reflected through a well proportioned, ideal cut diamond. As you can see by the illustration provided, when the light hits the diamond, all of the reflections of the light are coming back to your eye. There are other directions how light travels once it enters the diamond. The illustrations below show you how light leaks from the side and also from the bottom of the diamond.,

Diamonds that are too shallow or too deep may result in light leaking from the side and bottom of the diamond. Another fact that results for diamonds being to shallow and/or too deep is that the appearance of the diamond may look larger than it really is. Technically speaking, shallow and deep diamonds are not poor diamonds. They just happen to have those features which results in light leaking from the diamond and not having as much light reflect back to your eye. They are still “high quality” diamonds that are uniquely produced and cut to the best proportion available.

Loose Diamond Exchange has provided you a chart of GIA and AGS cut grade scale.
 GIA Cut Grade Scale Most Desirable -----------------------------------------------------------Least Desirable Excellent              Very Good             Good                  Fair                  Poor

 AGS Cut Grade Scale Most Desirable -----------------------------------------------------------Least Desirable 0               1                  2                  (3-4)                 (5-7)                 (8-10) Excellent              Very Good             Good                  Fair                  Poor

Listed below are the depth and table percentages that help Loose Diamond Exchange determine a cut grade on a diamond

 Loose Diamond Exchange Round Diamond Cut Grade Chart Ideal/Excellent Very Good Good Fair Poor Depth % 58 – 63 57 - 65 56 - 65 55 - 67 <55 or >67 Table % 52 – 58 51 - 62 51 - 64 50 - 70 <50 or >70

The depth and table percentages are very important in determining the cut grade of a diamond but there are others factors involved to also help classify the cut grade. Face-Up appearance, design, craftsmanship, light performance, proportion factors, and finish are also some of the criteria’s that are taking into consideration while determining a cut grade. We hope that the information provided here is intended as a basic, standard guide in helping you understand and selecting the finest cut grade of a diamond of your likings.

If you have any further questions about cut grades, please send us an e-mail at inquiry@loosediamondexchange.com or call toll-free at 877-732-2387 and a diamond consultant can be of further assistant to you.

• Diamond Care
•
• Diamond Certificate
•
The diamond certificate is a statement issued by an independent gemological laboratory that the diamond being evaluated has been examined by an experienced diamond grader. Loose Diamond Exchange strongly recommend you buying a diamond that is accompanied with a diamond certificate. We only sell diamonds that are accompanied with a certificate. GIA, EGL USA and AGS independent gemological laboratories are more accurate and reputable labs that we recommend and sell. There are other independent laboratories out there that are accompanied with a diamond but we recommend GIA, EGL USA and AGS laboratories. If you are interested in a diamond that is not accompanied with a diamond certificate, have a jeweler send it out to a reputable independent gemological laboratory to have it examined by an experienced diamond grader so that the diamond would have its own unique characteristic. With this being done, you would be able to always identify your diamond. Some of the characteristics that are shown on the diamond certificate are as listed: shape, measurements, weight, color, clarity, proportions, finish, and fluorescence as seen in the diamond while being evaluated using various high-tech gemological instruments. Listed below is information to help you understand and be more familiar with GIA, EGL USA and AGS diamond laboratories that we offer and respect. Please take the time and visit the diamond laboratory websites by clicking on their images below for further information.

Loose Diamond Exchange recommends you buying a diamond that is accompanied with a GIA, EGL USA, or AGS diamond certificates. Loose Diamond Exchange provides cheap GIA certified loose diamonds, discount loose diamonds and low cost high quality diamonds; learn why a diamond grading report from a reputable GIA, EGL USA, and AGS grading laboratory is important.

### GIA

Gemological Institute of America. The world’s largest and most respected independent laboratory. GIA was established in 1931, which provides a certificate with each diamond after being graded. Starting in 2006, any round brilliant diamond being taking into the GIA laboratories for grading will have a diamond cut grade characteristic. This cut grade would be provided on the certificates for round brilliant diamonds only. GIA is dedicated to serving the diamond industry as well as educating the public about diamonds.

### EGL USA

EGL USA is one of the largest and oldest independent gemological institutions focusing on gemstone certification and research. Originally part of an international network founded in Europe in 1974, EGL USA opened its first U.S. lab in the heart of New York's international diamond and jewelry district in 1977. Today the EGL USA Group has laboratories in New York City, Los Angeles, Vancouver, and Toronto. EGL USA is not affiliated with any other EGL labs outside North America. Every certificate issued by our lab states "A member of the EGL USA Group." Certificate numbers are preceded by either "US" or "CA," to indicate country of origin and to provide consumers the assurance that their certificate has been issued by a member of the EGL USA Group. In 1999 EGL USA initiated a Research Department to respond to the changing needs of the jewelry industry. It is one of only a few labs worldwide doing advanced research in gemology.

### AGS

American Gemological Laboratory. AGS has its own grading scale and cut grading system for round cut diamonds. AGS was founded in 1934 and is known for Ideal round cut diamonds. AGS is the first laboratory to issue a cut grade for fancy shapes and they set high standards on grading diamonds. Listed below is a chart of their grading scale.

These reports are accompanied with the diamonds to assure customers information on the diamonds being purchased. They are not a guarantee, valuation or appraisal, due to that these reports are tested, examined and analyzed by professional representative’s opinions from these respected laboratories. The reports contain characteristics of the diamond being graded and have made no representation or warranty regarding the report or diamond being described. For further information, please read reports when received.

• Diamond Glossary
•
• Diamond Shapes
•
Diamonds come in all form of shapes. The most common and popular shape is round and all the other diamond shapes are called “Fancy Shape”. There are many shapes of diamonds that exist today and each one has its own unique touch that catches the consumer’s eye. Loose Diamond Exchange provides and sells 11 different diamond shapes. Listed below are visuals of the diamond shapes with brief factual information on the diamond shapes.

The most common and popular shape is round and all the other shapes are called fancy shape diamonds. Learn about diamond shape, round cut brilliant shape, princess shape, emerald shape, radiant shape, oval shape, pear shape, marquise shape, heart shape, asscher shape, cushion shape and trillion shape at Loose Diamond Exchange. Pick your discount certified loose diamond shape at Loose Diamond Exchange and buy today in Houston.

 Round Princess Emerald Radiant Oval Pear Marquise Heart Asscher Cushion Trillion

Round diamonds set the standards for the most popular diamond offered on the market and they are circular shaped. Round diamonds display the most brilliance, sparkle, fire out of all the diamonds. Due to the proportion that this diamond has to offer, it is said that round diamonds are higher priced then other diamonds.

Princess diamonds have 4 sharp edges that have a square shape. Princess diamonds also come in a rectangular shape and they produce a lot of sparkle. Princess diamonds don’t have as much brilliance as due round diamonds but for a square shape, they give out enormous sparkle. When setting a princess shape diamond, you need to assure that the prongs on the setting are securing the 4 sharp edges on the diamond due to the risk of chipping the edges.

Emerald diamonds are classy rectangular shaped with cut corners. It has step cut facets and higher quality emerald diamonds are recommended. The emerald diamond has less sparkle then the traditional round diamond, but it carries its own unique sparkle and elegant look.

Marquise diamonds are in a shape of a football; an elongated shape with pointed ends. This diamond is extremely gorgeous when displayed as a solitaire.

Radiant diamonds are truly a unique diversified diamond. This square or rectangular shaped diamond displays clipped off corners like emeralds diamonds with the brilliance of a round diamond. The preferred look for a radiant diamond would be the square shape.

Asscher diamonds are very unique diamonds which have deeper step cut facets than emerald diamonds. Asscher diamonds are usually octagonal in shape or a square shape with angles. This diamond shape gives you a true tour of how a diamond looks inside and high quality is recommended.

Oval diamonds have an elliptical shape to them. They are soft spoken diamonds that have a glassy look. Oval diamonds can have a better brilliant than other diamonds when proportioned well.

Pear diamonds have a tear drop shape; they are usually displayed in pendants. This unique shape reflects light very well when the diamond is proportioned well.

Heart diamonds are almost like pear shaped diamonds with a cleft shape on the top. Heart diamonds are the most distant symbol of love.

Cushion diamonds are sometimes referred to as pillow shaped. This diamond has a square and sometimes a rectangular shape with rounded corner as well as deep cuts with large facets. Cushion diamonds are unique and elegant in its own because of the limited people that request and wear this diamond.

Trillion diamonds are triangle shaped which are also called Trilliants. This diamond has a lot of brilliant for a triangle shaped diamond. It has 3 points which can either be pointed or more rounded corned. Trillion diamonds are used in two ways: as a diamond accent in fine jewelry or as a solitaire, either way shows the brilliant of this diamond.

If you have any further questions about diamond shapes, please send us an e-mail at inquiry@loosediamondexchange.com or call toll-free at 877-732-2387 and a diamond consultant can be of further assistant to you.