Diamond Information

Thank you for visiting Amcor Design for your jewelry needs. If you are shopping for an engagement ring or just a beautiful piece of jewelry, we welcome you to read the information about diamonds below.

Remember, we are always available to help you with any questions. We look forward to serving you and helping choose that perfect piece or a diamond for a lifetime of enjoyment.
Please feel free to call us at 1.800.715.6380, 1.212.354.2275 or email sales@amcordesign.com for additional information.

Here is a bit of education about diamonds and the 4’cs that will help you purchase the perfect diamond.

Diamond weight and points

In discussing diamond weight, you often hear the term points used. For example, you might hear that a diamond is 83 points. This has the same meaning as .83 carats, because there are 100 points to a carat. Thus, .50 carats would be the same as 1/2 carat or 50 points, 1.50 carats would be the same as 1 carat and 50 points or one and one half carats.

Approximate sizes are displayed below (in 100% zoom setting).
In making your purchasing decision, it is important to realize that a 2 carat diamond will not look twice the size of a 1 carat diamond. Because a diamond is three dimensional, the carat weight is dependent on both the diameter and depth. A 1 carat ideally cut diamond averages about 6.45 millimeters in diameter. A 2 carat ideally cut diamond averages about 8.15 millimeters in diameter. This is about 26% more in diameter than the 1 carat. The price, however, can be about 4 1/2 times greater. As diamonds get larger, they also get rarer; thus, the price per carat increases accordingly.

How big of a diamond should I buy?

Carat weight is a personal decision. Some of our customers choose a smaller diamond in order to have very high color and clarity. Others will sacrifice on the color or clarity to get a larger diamond. Regardless of the choices made, we suggest purchasing a diamond that will show off beautifully in appearance. At Amcor Design, we will only sell diamonds that meet our standards for color, cut, and clarity.

Information about the 4 C’s of Diamonds: Clarity, Color, Cut, Carat Weight

The Clarity
The Clarity, an important category in the 4 C’s, relates to exactly how clear a diamond is and describes the presence, or absence, of inclusions. The majority of diamond inclusions cannot be seen by the human eye, so systems have been developed to grade diamond clarity as detailed in a Diamond Clarity Chart.

The clarity scale is broken down into the following grades:






Free from all inclusions or blemishes.


Internally Flawless

No inclusions visible at 10x magnification.


Very Very Slightly Included #1

Inclusions that are extremely difficult to locate at 10x.


Very Very Slightly Included #2

Inclusions that are very difficult to locate at 10x.


Very Slightly Included #1

Minor inclusions that are difficult to locate at 10x.


Very Slightly Included #2

Minor inclusions that are somewhat difficult to locate at 10x.


Slightly Included #1

Noticeable inclusions that are easy to locate at 10x.


Slightly Included #2

Noticeable inclusion that are very easy to locate at 10x.


Included #1

Obvious inclusions. Somewhat easy to locate with the unaided eye.


Included #2

Obvious inclusions. Easy to locate with the unaided eye.


Included #3

Obvious inclusions. Very easy to locate with the unaided eye.


The Color
The Color, another important category in the 4C 's, refers to lack of color and whiteness of a diamond in grades. It relates to rarity, value and quality of a Diamond. The natural Color grading is the grading based on absence of pale yellow that manifests in a Diamond. The grading starts from D for a colorless Diamond going all the way to Z for the presence of Light Yellow tinge. D is the highest grading and Z is the lowest.  
What is the difference between natural and treated colored diamonds? Natural colored diamonds are a unique natural product created over thousands of years by the process of crystallization. Factors affecting diamond color include fluorescence and color enhancements such as high pressure, high temperature treatment and irradiation. These are called the treated color diamonds.

The rarity of naturally "fancy" color diamonds is what makes the price go up. If you are looking for one of the "fancy" colored diamonds, don't except to pay less.

The Cut
The Cut of a diamond, refers to two separate factors. The first factor relates to the shape and style of the cut e.g. Pear, Round, Marquise, Princess, Brilliant Heart shaped, etc. The second factor is the way the rough diamond is cut to produce a polished diamond. The effects of a good diamond cut result in the heightened levels of brilliance, fire, sparkle and luster of a diamond. A diamond cut with good proportions reflect more light, appears to look better than other diamonds of similar clarity and can appear to look 2 or 3 grades higher than the actual color. The quality of a Diamond is thus dependent upon the cut of the diamond facets.

Diamonds are cut into a number of different shapes:

Most diamonds have one of three basic facet arrangements brilliant, step, or mixed. Brilliant cut diamonds have a facet pattern that radiates from the center of the stone toward the edge with triangle or kite shaped facets, ex. Round Brilliant. Step cut diamonds have concentric rows of trapezoidal facets running parallel to the girdle, ex. Emerald cut. A mixed cut diamond combines both brilliant and cut facets and set cut facets; often this style is seen as a diamond with a step cut crown and a brilliant cut pavilion. Mixed cuts are not common.

Whatever the shape, a well-cut diamond is the work of a master diamond cutter. It is the cut that enables a diamond to make the best use of light. Light reflected from one facet to another is then dispersed through the top of the stone. If the cut is too deep, light escapes through the opposite site of the pavilion. If the cut is too shallow, light escapes out the pavilion walls before it can be reflected.

The proportions displayed by the stone are very significant. Two of the key factors in the grading of cut quality -- table percentage and depth percentage -- are usually expressed on grading reports. Measurement of three different parameters allows for easy calculation of these percentages by using the formulas expressed below.
For example, for a round brilliant cut diamond, table percentage is calculated as follows:
Table (%) = longest table measurement (in mm)
average girdle diameter (in mm)

And for depth percentage:
Depth (%) = depth (in mm)
average girdle diameter (in mm)

Without attention to quality cutting, light is lost and not returned to the eye.

Proportions Criteria are as shown below:


"Premium Cut"

" Ideal Cut"

"Excellent Ideal Cut"


Total Depth

58.8% - 63.8%

58.0% - 63.8%

59.2% - 62.4%


Table Size

58.0 - 61.0%

53.0% - 58.0%

52.5% - 58.4%


Crown Height

13.0% - 17.0%

14.2% - 16.2%



Crown Angle

32.7° - 36.3°

33.7° - 35.8°

32.5° - 35.4°


Pavilion Depth

41.7% - 45.0%

42.2% - 43.8%

41.5% - 44.4%



The Carat Weight
What does the Carat Weight of a diamond mean? A Carat is a standard unit of weight for diamonds. Carat weights are also expressed as "points" with a one carat diamond equaling 100 points. The term 'carat' is often misunderstood to mean the size of a diamond. The size of a diamond relates to the dimensions of diamonds in terms of length, width and height. As the carat weight is a unit of measure of the weight, and not the size. Two diamonds both weighing 1 carat may appear to be different sizes! The final size of a 1 carat diamond depends on how it is cut. Some diamonds will have extra weight on the bottom part, or pavilion and therefore appear smaller. A well cut diamond will sometimes appear larger than many diamonds of a heavier carat weight.

How to Care for Your Diamonds

Diamond is the hardest natural substance on Earth. It can scratch any kind of rock or metal, but only another diamond can scratch a diamond. In fact, a diamond must be heated to a temperature of 1292 degrees Fahrenheit before it will burn. Yet the oil deposited from the mere touch of a human finger can cause dirt to collect and make this nearly indestructible gemstone quickly lose its sparkling appeal.
Handle your diamond sparingly. Because diamonds are natural magnets for grease, they are not easy to keep clean. Handling a diamond with your fingers provides enough oils from your skin (the type of “grease” that most affects diamonds) to alter the way your diamond looks.

Clean your diamond regularly. A simple plan to keep your diamond jewelry always looking beautiful is to soak the diamond in an ammonia-based household cleaner (such as window cleaner) overnight, once or twice weekly. In the morning, remove the diamond from the cleaner and brush it with a soft, clean toothbrush (one that has not previously been used in any way, and that you reserve exclusively for cleaning your diamond) to remove any leftover dirt. Take extra care to brush the back of the diamond as this will be the area that has collected the most oil and dirt.

Be aware that fragile settings and antique jewelry won’t take kindly to being scrubbed with a toothbrush, so use a soft touch. Then, just rinse the diamond with water and wipe with a soft, lint-free cloth.

Don’t use harmful solutions. Chlorine (as in household bleach) or abrasives (such as household cleansers or toothpaste) should never be used when cleaning diamonds, especially those set in jewelry. These erode some of the metals often used in diamond settings, and may loosen prongs, or even dissolve the metal completely.

Sometimes an ultrasonic cleaner is necessary to remove encrusted dirt on diamonds. By sending high frequency sound waves through a detergent solution, ultrasonic cleaners cause vibrating fluid to remove accumulated dirt and grime. However, they can also shake loose stones from their mounting, so this method shouldn’t be used on fragile settings (or estate jewelry), and is best undertaken by a professional jeweler.

Regular cleaning will keep your diamond jewelry in gleaming condition and ready to sparkle on that special occasion.


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