Personalized Assistance Selecting Diamonds

At Block Jewelers we believe that there are not many more important decisions than making a lifetime commitment of love. A diamond is a great way to symbolize the meaning of the bond you share. With so many choices, how does one decide?

Some people have a diamond handed down in the family. Others choose to compare prices and buy online. With over 80 years in the jewelry industry, we feel that the only way to truly be sure you're getting the perfect diamond is to compare a number of different diamonds side by side. This is necessary because no two diamonds are the same. Even diamonds with the same grades according to the 4Cs of quality can show differences in sparkle and size when compared to one another in a live environment.

You'll need to do a thorough comparison before making such a personal decision. This can best be accomplished by visiting a reputable jeweler who offers a wide selection of loose diamonds and mountings. We at Block Jewelers would be honored if you choose us. Learn more about diamond shapes and the 4Cs of quality below.

Diamond Shapes

Choose a diamond that reflects your style. You may prefer a more traditional shape such as Round, Emerald, or Asscher cut; or a fancy shape such as Marquise, Heart, or Pear. If you are looking for a contemporary shape, consider the Princess or Radiant cut.












The 4Cs of Diamond Quality

While cut can refer to the shape of a diamond, it also specifies the dimensions of the diamond. These proportions ultimately determine the amount of brilliance and sparkle you see when the diamond is face-up.
Largest facet of a gemstone
Top portion of a diamond extending from the girdle to the table
Intersection of the crown and pavilion which defines the perimeter of the diamond
Bottom portion of a diamond, extending from the girdle to the culet. A pavilion depth that's too shallow or too deep will allow light to escape from the side of the stone, or leak out of the bottom. A well-cut diamond will direct more light back to the eye.
Facet at the tip of a gemstone

Good Proportions
Light is reflected
back to the eye

Too Deep
Light escapes
through the side

Too Shallow
Light escapes
through the bottom

Color refers to the diamond's overall natural body color which can range from colorless to light yellow. The color you choose is a matter of personal preference as there are no "good" or "bad" colors. There are beautiful diamonds at every color grade. However, colorless diamonds are more rare than those which show yellow, making them more valuable as a rule.

Near Colorless
Faint Yellow
Very Light Yellow
Light Yellow

Each diamond has internal characteristics called inclusions which occurred at the time of its formation in the earth. Clarity refers to the number and visibility of these characteristics under 10x magnification and to the naked eye. The less visible the inclusions, the more rare and more valuable the diamond is.


Internally Flawless




I1, I2, I3

Inclusions not visible
to the naked eye

Imperfect to
the naked eye

The carat is a standard unit of measurement used in reporting the weight of a diamond. The more a diamond weighs the more rare it is, thus the more valuable it is in general. The weight of a diamond is also related to its size.

0.25 ct

0.50 ct

1.00 ct

1.25 ct

1.50 ct

1.75 ct

2.00 ct

2.50 ct

3.00 ct

Graphics not drawn to scale, derived from content provided by Gemological Institute of America.

Choosing to own a diamond is unique in that it is both an investment decision and an emotional decision. The four Cs determine the value of the diamond, but not necessarily whether it will be most appealing to you. Each of us has a different set of standards when it comes to beauty.

We would be honored to be a part of the process of helping you find that delicate balance between value and beauty.