Our Diamonds

Minichiello Jewellers offers only the finest of quality loose diamonds in any shape you can imagine.  We uphold strict buying procedures to ensure that each diamond you view and receive meets our selective Four C criterias.  All of our diamonds are independently graded and certified by reputable gemology houses across the globe.

Diamonds are valued and graded by a universal system known as the ‘Four C’s’ which was originated by the Gemology Institute of America (GIA). This grading system is essential to objectively compare and evaluate Diamonds. The Four C’s include value factors such as Carat, Clarity, Color and Cut.


Carat is the standard unit of measurement for Diamonds and other gemstones. One carat is equal to 200 milligrams or 1/5 of a gram. Another way to think about carat weight is in terms of dollars and cents. A dollar is equal to 100 pennies and a carat is equal to 100 points. For example, a 75-point diamond is equal to 0.75 carats.

An individual diamonds carat weight and dimensions will influence its value. Many people think that the larger the diamond, the more it will cost but this isn’t always true. Differences among the other C’s (color, clarity and cut) can make a small diamond much more valuable than a larger one. This is something to always keep in mind when comparing diamonds to one another.


Because of the way diamonds are formed deep within the earth’s surface, they often will have some type of ‘birthmark’ that is unique unto itself. This birthmark will either be inside the diamond, known as an inclusion, or on the surface of the stone, known as a blemish. The location, size, and visibility of the birthmark will determine the clarity grade of the diamond.

At Minichiello Jewellers we carry only those diamonds that are ‘flawless to the eye’. In other words, no inclusions or blemishes are visible with the naked eye, they can only be seen under 10x or higher magnification. This includes those diamonds graded from:

Internally Flawless to SI-2 Clarity Grades



Diamonds are found in almost every color of the rainbow but the most sought after stones are those that don’t have any color at all. These diamonds are graded on what is known as the ‘D to Z’ scale which was put in place by the Gemology Institute of America (GIA). When a diamond approaches colorless and gets closer to a grading of ‘D’ the value will increase as well. Once a diamond begins to exhibit increasing tints of color (yellow or brown) the value will start to fall.

At Minichiello’s, color is a very important value factor because the untrained eye can pick up these subtle tones of color. You can spot the difference between a nice, white diamond that is free of color and a diamond that exhibits a yellow hue. That is why we keep our diamonds in the top 5 grades of the Color Grade Scale – those diamonds that fall within the:

D-H color range.



Diamonds can be found in virtually all shapes and sizes thanks to advanced cutting technology in the jewellery industry. The most brilliant of the shapes are the round brilliant cut diamond and the princess cut diamond. Close behind these shapes are the cushion cut diamond, the oval cut diamond and the radiant cut diamond. Even an emerald cut diamond will have a hint of sparkle as the light reflects off the precisely cut facets.

Cut isn’t solely about the shape of a diamond, it affects many other aspects of a diamonds overall appearance. Cut is the value factor most responsible for giving diamonds their sparkle, brilliance and fire. It is one of the most important value factors because without balanced proportions and precise symmetry and polish, a diamond wouldn’t nearly be as dazzling. In a very well cut diamond, the light is returned out of the top of the diamond and reflected at the highest level. The cut grade scale of a diamond uses simple terminology ranging from Excellent to Poor.

At Minichiello Jewellers, cut plays a very important role to ensure that everyone goes home with the brightest diamond possible. We want our diamonds to sparkle even in the dimmest lit room. This is why the majority of our diamonds are within the top two grades of the Cut scale :

Excellent to Very Good.

For more detailed information on these topics and other interesting diamond facts
please feel free to visit WWW.GIA.EDU.