Understanding the 4 C’s of Diamonds: A Simple Guide

Every diamond tells a story — let’s help you understand yours.

Cut: The Sparkle Factor ✨

Out of all the C’s, cut is the star of the show. It’s not just the shape (like round or oval) — it’s how well the diamond has been shaped and polished. A beautifully cut diamond will capture light and dazzle with every movement. A poorly cut one? Even the biggest stone can seem dull.

Old Main Tip

Prioritize an excellent or ideal cut for the most breathtaking sparkle.

Color: The Whiter, the Brighter

Diamonds come in a natural range of colors, from icy white to warm tones. The less color a diamond shows, the higher it tends to be graded (and the more brilliant it can appear).

• D-F: Colorless — crisp, pure beauty

• G-J: Near-colorless — a smart, beautiful choice that looks fantastic in most settings

Old Main Tip

Near-colorless diamonds often offer the best mix of beauty and value.

Clarity: Tiny Flaws You’ll Never Notice

Clarity is about how “clean” a diamond is from natural marks called inclusions. Flawless diamonds are rare and precious, but most inclusions are invisible to the naked eye.

Old Main Tip

Choose an “eye-clean” diamond — where inclusions can’t be seen without magnification — and invest your budget where it counts most: cut and carat.

Carat: Size Matters (But So Does Everything Else)

Carat refers to a diamond’s weight. Larger diamonds are rarer and more expensive, but size isn’t everything. A stunning, well-cut diamond will outshine a heavier one every time.

Old Main Tip

Diamonds just under full-carat weights (like 0.90 instead of 1.00) can look nearly identical but offer noticeable savings.

The Old Main Gem Co. Way

At Old Main Gem Co., we believe that your diamond should be as unique as your story. It’s not about chasing perfection — it’s about finding the perfect balance that fits you.

Whether you’re dreaming of a timeless solitaire, a modern halo, or a custom creation filled with meaning, we’re here to guide you with honesty, expertise, and heart.

Have questions? Curious to start your search? Reach out to us here or browse our latest collection for inspiration. ✨

Old Main Gem Co.

Where your story becomes your gem.