A Comprehensive Diamond Buying Guide

Become a master with our diamond buying guide. Learn the Four Cs, explore shapes, understand certification, and set a budget. Buy with confidence and style.

Purchasing a diamond is a significant investment, one that often marks a special occasion or milestone in our lives. As professional jewelry appraisers, we at Gemological Laboratory Services understand the intricacies involved in selecting the perfect diamond. In this guide, we’ll walk you through the essential aspects of diamond buying, helping you to make an informed and confident choice.

Understand The Four Cs

The diamond industry evaluates diamonds based on the Four Cs: Carat, Cut, Clarity, and Color.

  • Carat: This refers to the weight of the diamond. One carat equals 200 milligrams, and larger diamonds are rarer and more valuable. However, bigger isn’t always better—consider the size that best fits your personal style and budget.
  • Cut: The cut refers to how well the diamond has been cut from its raw form. It impacts the diamond’s symmetry, proportions, and ability to reflect light. The quality of the cut significantly affects the diamond’s brilliance and sparkle.
  • Clarity: Diamonds naturally have imperfections, referred to as inclusions and blemishes. Clarity grades the absence of these flaws. Flawless diamonds are extremely rare and, consequently, more expensive.
  • Color: This grades the diamond’s colorlessness. The Gemological Institute of America’s scale ranges from D (colorless) to Z (light yellow or brown). Diamonds closer to D on the scale are more valuable.

Diamond Shape

Diamonds come in various shapes, with each offering a different aesthetic. The most popular ones include round, princess, oval, marquise, pear, cushion, emerald, asscher, radiant, and heart. The shape of the diamond can influence its brilliance and is generally a matter of personal preference.


Ensure that the diamond you’re considering is certified by a reputable lab, such as the Gemological Institute of America (GIA) or the American Gem Society (AGS). These certifications verify the diamond’s quality and attributes, giving you assurance about your investment.


Decide on a budget that works for you. Remember, buying a diamond isn’t just about size and sparkle—it’s about finding a gem that you’ll cherish. Prioritize the factors that are most important to you, whether that’s the carat weight, the cut quality, the clarity grade, or the color rating.

Consult with a Professional

Lastly, consider seeking advice from a trusted professional. At Gemological Laboratory Services, we provide jewelry appraisal, gem identification, and diamond certification services to help you make the best decision. We’re here to answer any questions you might have and guide you through the diamond buying process.

By understanding these crucial aspects of diamond buying, you’ll be well-equipped to find a diamond that suits your style, aligns with your values, and fits your budget. Happy diamond shopping!