The Gemological Institute of America (GIA) is an independent, non-profit organization whose laboratory provides a variety of high-quality, gem grading and identification reports. The GIA is among the best grading labs in the country, ensuring the strictest grading certificates. Diamond grading reports for unmounted diamonds determine their key characteristics: color, clarity, cut, and carat weight.

The strict GIA grading allows our customers to have confidence in their purchase. Select Jewelers is proud to have an expansive GIA-certified diamond inventory, which make perfect Engagement Rings



Though generally thought of as a colorless gemstone, diamonds do come in a spectrum of colors and shades. The most colorless diamonds are considered the most desirable. Diamond color is ranked on an alphabetic scale from D to Z, with D being completely colorless and Z being light yellow or brownish.

Colorless diamonds are actually very rare and as such, they are the most expensive on the market. Yellow or brown diamonds are also rare, simply because jewelers avoid carrying them. Most jewelry stores carry diamonds in the G to M range.


Clarity refers to the amount of flaws in a diamond. Almost every diamond has some flaws, though most are only perceptible under a microscope. The number, size, position and color of flaws determine a diamond’s true value. Perfectly clear or flawless diamonds are so rare that only a few hundred are sold worldwide each year – and they are extremely expensive.

Diamond clarity is ranked on a scale from Flawless (FL) to Included (I1, I2, I3). Inclusions are a diamond’s internal flaws, such as tiny cracks or black carbon spots inside the stone.

For sparkle and shine, cut is the one C you want to spend a little extra on. The proportion and depth at which a diamond is cut are responsible for the amount of light that passes through it. A perfect cut will reflect light upward, making the diamond appear to be shimmering.

Carat is a weight measurement specifically used to measure gemstones. One carat weighs about 200 milligrams, about the weight of a paper clip. Most ring diamonds are weighed in ¼ increments, and the heavier the stone, the more valuable it is. Stones that weigh beyond a carat are exceptionally rare.

Although not one of the 4 C’s, diamond shape is often the easiest place to start the diamond selection process because so many customers know which shape they want before they walk into the store.

The most common diamond shapes are:

A diamond’s shape is an expression of the person wearing it. Asscher and emerald shapes are more showy and eye-catching; pear and heart shapes are very specific looks that are full of glamour, but are not necessarily for everyone; while round and princess shapes are traditional and timeless. If you’re buying a diamond for a loved one, try to get an idea of the diamond shapes he or she prefers – this information tells us a lot about the person you’re shopping for!

Choosing a Diamond

With over 40 years of experience in the jewelry industry, Select Jewelers provides our customers with the kind of one-on-one expertise you only get from a family jeweler. Our staff includes three master jewelers and two gemologists, one with a master’s degree in diamonds. Not only do we host one of the best diamond inventories in the Houston area, but we also specialize in custom jewelry. When you work with Select Jewelers, you’re sure to get the right diamond in the right setting, no matter what.