The Four Cs of Diamonds
Every diamond tells a story written in light. Understanding the four qualities that define a diamond helps you choose with confidence and find the stone that's truly yours.
The First C
Cut
Of all the 4Cs, cut has the greatest influence on a diamond's beauty. Cut is not about shape. It is about the precision of proportions, symmetry, and polish. A masterfully cut diamond captures light from above and returns it through the top as brilliance, fire, and scintillation. Even a colorless, flawless stone will look lifeless without an excellent cut.
- BrillianceThe pure white light that bounces back through the crown. Brilliance is what makes a diamond glow from across the room.
- FireWhite light dispersed into spectral color. The vivid flashes of red, blue, and violet that make a diamond come alive.
- ScintillationThe sparkling pattern of light and shadow that dances across a diamond as it moves.
- Our tipAlways prioritize cut above all other factors. It is the one quality that makes a diamond truly breathtaking.
The Second C
Color
Diamond color measures how closely a stone approaches true colorlessness. The GIA grades diamonds from D, perfectly colorless, through Z, noticeably warm or yellow. Each grade represents a narrow range and the differences between consecutive grades are subtle, often invisible without direct comparison. Yet those subtle distinctions have a meaningful impact on rarity and price.
- D – FThe rarest and most sought after color range. Completely free of detectable color under any lighting or conditions.
- G – JAppears colorless face up in virtually all settings and lighting conditions. The sweet spot for beauty and value.
- K – MA faint warmth that becomes visible to the naked eye. Pairs beautifully with yellow and rose gold settings where the metal complements rather than contrasts the stone.
- Our tipWe recommend G or H for most customers. Both grades offer outstanding value and complement every mounting style and metal color.
The Third C
Clarity
Clarity describes the absence of internal inclusions and surface blemishes. Think of them as a diamond's fingerprints, unique characteristics formed during crystallization that make every stone truly individual. The GIA clarity scale spans eleven grades from Flawless to Included. Fewer and smaller inclusions mean greater light transmission and a more brilliant stone.
- FL / IFNo inclusions or blemishes visible under 10x magnification. Fewer than 1 in 5,000 diamonds qualify for Flawless or Internally Flawless.
- VVS1 / 2Minute inclusions that are extremely difficult to detect even under 10x magnification. Completely eye clean in everyday ware and an exceptional value compared to Flawless grades.
- VS1 / 2Minor inclusions difficult to locate even under magnification. These diamonds are eye clean in virtually all cases and represent an outstanding balance of quality and price.
- Our tipWe recommend VS2 or SI1 for most customers. These grades deliver beautiful, clean looking stones at a price point that leaves more room in the budget for cut, color, or size.
The Fourth C
Carat
Carat measures a diamond's weight, with one carat equaling exactly 0.2 grams. A larger diamond is generally rarer and commands a higher price, but carat weight alone does not tell the whole story. Cut quality, shape, and proportions all influence how large a diamond appears. A well cut stone will always look more impressive than a heavier one with a poor cut.
- 1 caratThe benchmark carat weight for engagement rings. A one carat round brilliant measures approximately 6.5mm in diameter and is the most popular choice for center stones.
- PricePrice does not scale linearly with carat weight. A two carat diamond can cost four times as much as a comparable one carat stone, reflecting the rarity of larger diamonds.
- ShapeShape has a significant impact on how large a diamond appears. Oval, pear, and marquise cuts appear larger face up than a round brilliant of the same carat weight.
- Our tipBuy just below a popular carat thresholds. 0.96ct is visually the same as a 1.00ct in everyday wear but typically comes at a better price.
Diamonds at Gordon Jewelers
How We Choose
The 4Cs tell you what a diamond is. Budget tells you what is possible. Most people have a size in mind first, and that is completely understandable. How you prioritize the 4Cs has a significant impact on the quality of diamond you choose. We start with budget and work through cut, color, clarity, and size in a deliberate order that consistently delivers the most beautiful diamond for your dollar. Every customer is different and there is no single right approach. This is ours.
- BudgetSets the ceiling for every other decision. Lab-grown diamonds can stretch it 60 to 85 percent further than a comparable natural stone.
- CutExcellent or Ideal, every time. Cut is truly non-negotiable. The best color and clarity can not help a poorly cut stone.
- ColorWe target G or H for most customers. Near colorless in any mounting and an excellent value compared to the grades above.
- ClarityVS1 through SI1. Clean and beautiful in everyday wear at a price point that allows for better decisions elsewhere in the budget.
- CaratMost people shop by carat weight. We shop by millimeter size because how it looks on the finger is what matters.
Common Questions
Diamond 4Cs FAQ
Cut. It has the greatest influence on a diamond's beauty because it determines how the stone returns light as brilliance, fire, and scintillation. Even a colorless, flawless diamond looks lifeless with a poor cut, so we recommend prioritizing cut above the other three Cs.
For most customers we recommend G or H. Both appear colorless face up in virtually all settings and offer outstanding value compared to the rarer D through F grades. In yellow or rose gold, you can often go a little lower since the warm metal masks slight color.
We recommend VS2 or SI1 for most customers. These grades look clean to the naked eye, with inclusions visible only under magnification, and they leave more room in the budget for cut, color, or size than the higher Flawless and VVS grades.
Not always. Carat is weight, not size. Cut quality, shape, and proportions all affect how large a diamond looks face up. A well-cut stone can look larger than a heavier one with a poor cut, and shapes like oval, pear, and marquise appear bigger than a round of the same weight.
We start with budget, then prioritize cut (Excellent or Ideal), then color (G or H), then clarity (VS1 through SI1), and finally size, which we judge by millimeter measurement rather than carat weight because how a diamond looks on the finger is what matters most.
