Diamonds are evaluated using the Four Cs: cut, color, clarity, and carat weight. Together, these characteristics determine a diamond's quality, beauty, and value. Understanding them empowers you to make informed decisions when buying diamond jewelry and helps you appreciate why two diamonds of the same size can have dramatically different prices.
At Legacy Jewelers & Estate Buyers in Simpsonville, owner Erik Peterson educates every diamond customer about the Four Cs as part of the shopping experience. Rather than simply presenting a selection, Erik explains what you are looking at and why it matters.
Cut is widely considered the most important C because it has the greatest impact on visual appeal. Cut does not refer to the diamond's shape — round, oval, emerald, cushion — but to how well the facets interact with light. A well-cut diamond reflects light internally and disperses it through the top, creating the brilliance and fire that make diamonds captivating. A poorly cut diamond looks dull because light leaks through the bottom or sides.
Cut is graded from Excellent to Poor by major gemological laboratories. For round brilliant diamonds, Excellent and Very Good cuts offer the best balance of beauty and value. The precision required means some rough diamond is sacrificed for optimal proportions — which is why well-cut diamonds carry a premium that is visible every time the diamond catches light.
Color refers to the absence of color. The most valuable diamonds are completely colorless, allowing maximum light to pass through. The Gemological Institute of America grades color from D (colorless) to Z (light yellow). Differences between adjacent grades are extremely subtle and often invisible to the naked eye. Most customers find diamonds in the G to I range offer excellent appearance at a more accessible price.
Some colored diamonds — fancy yellows, pinks, blues, greens — are valued specifically for their intense color and can command prices far above white diamonds.
Clarity measures internal characteristics called inclusions and external characteristics called blemishes. Nearly all diamonds contain some inclusions, natural imperfections formed during crystallization. The clarity scale ranges from Flawless to Included.
For most purposes, diamonds in the VS and SI ranges offer the best value. These have inclusions not visible to the naked eye, meaning the diamond appears clean in normal viewing conditions. Paying a premium for higher clarity produces a difference visible only under magnification.
Carat weight measures how much the diamond weighs. One carat equals 200 milligrams. Larger diamonds are rarer, so price per carat increases exponentially with size. A two-carat diamond costs significantly more than twice a one-carat diamond of the same quality.
A smart strategy is looking for diamonds just below popular size thresholds. A 0.95-carat diamond may cost meaningfully less than a 1.00-carat of identical quality, with an imperceptible size difference.
At Legacy Jewelers, Erik helps customers navigate these decisions based on priorities and budget. Some prioritize size, others brilliance, others clarity. There is no single right answer — the best diamond is the one that makes you happy within your means.
Legacy Jewelers also buys diamonds, providing evaluations that take all Four Cs into account. If you have a diamond to sell, Erik can provide an honest assessment and fair offer.
Visit Legacy Jewelers at 3725 Grandview Drive in Simpsonville, Monday through Saturday from 10:00 a.m. to 5:00 p.m., to explore diamonds with a knowledgeable professional.
