Best Diamonds and Custom Jewelry in Modesto, CA



If you’ve ever shopped for a diamond, you have probably heard of “The Four C’s” which includes diamond cut, clarity, color, and carat. The Four C’s consist of the four main factors to consider when buying a diamond – Carat, Color, Clarity, and Cut. With years of experience in procuring the right stone for customers, Robert J. Nuccio, helps you find the diamond that best fits both your style and your budget.


Diamonds and other gemstones are weighed in metric carats. This is different from karat which refers to the purity of gold. The weighing system is an age-old old and global measuring tool. An easy point of reference to remember is that one carat point is equal to about 0.2 grams. Carats are divided into 100 points – in other words, for example, a 50-point diamond weighs 0.50 carats. The carat weight, when factored with the other C’s, has an impact on the price of your diamond.  See image to right for relative sizes (dependent on your browser settings, sizes may not be actual).

Carat Weight
Color Scale

Diamond Color

In this C, color actually refers to the lack thereof. In other words, the desirable diamond is the one with no color at all. Most color distinctions are not recognizable to the untrained eye and are ever so subtle. However, these slight differences have an impact on the quality and the price of the diamond. A diamond’s color is graded on a scale denoted D through Z – with D referring to “absolutely colorless” and Z referring to “noticeable color”. Unless you are looking for fancy-color diamonds, such as pinks, blues, yellows, and even browns, then the closer to colorlessness your diamond, the higher the quality.

Diamond Clarity

Clarity describes the clearness or purity of a diamond and is determined by the number, size, nature, and location of imperfections in the diamond – often referred to as inclusions (which are internal) and blemishes (which are external). Classified via a grading scale, Clarity consists of 11 categories ranging from F for flawless to I3 for included #3 and is rated using a 10x magnification.

While most diamonds fall somewhere in the middle of the grading scale, depending on your needs, some factors carry less significance in your diamond selection process. For example, an imperfection may often be so small, otherwise known as “eye clean”, that it is undetectable to the human eye and has an impact on the final cost of the stone.

Diamond Cut

The cut of the diamond may be one of the most crucial components of The Four C’s because the cut determines the sparkle and brilliance of the diamond. The number and proportion of the cuts, all ideally balancing the width and depth of the diamond, most certainly have an effect on how light travels through the diamond thereby affecting the diamond’s brilliance.

For example, if a diamond is too shallow, then light is lost out the bottom of the gem and if a diamond is too deep, then light is lost out the sides both giving the diamond less sparkle. Ideally the diamond is cut proportionally, called an Ideal Cut, allowing light to reflect to the surface and bringing out the sparkle.

The standard cut used by most jewelers is the round cut and all other cuts are referred to as fancy cuts. However there are many traditional and even newer fancy shapes including the princess cut; the emerald cut; the oval; the pear; the heart, the cushion; the round Hearts and Arrows; Radiant; Lucere etc.

Robert Nuccio can create a wedding ring with an ideal cut diamond just for you!

Knowledge, Resources, and Quality

In addition to working with clients to select the perfect diamond, Robert also has extensive experience in locating precious gemstones, too. As with diamonds, the selection process for gemstones is involved and can be affected by the stones rarity, durability, and popularity.

With years of experience in the fine jewelry-crafting business, Robert is skilled at sourcing several options from quality diamond and gemstone suppliers from around the world. His knowledge of the mechanics of jewelry crafting accompanied by his keen ability to create unique pieces for each client, always result in a quality piece of jewelry which will satisfy both style and budget.

For additional information about diamonds and precious gemstones, visit the websites of the Gemological Institute of America and American Gem Society Laboratories. Robert J. Nuccio uses only these two labs for diamond certifications.

Clarity Scale