Cut is the most technical and arguably the most important of all diamond characteristics. Unlike color, clarity, or carat weight, cut is the only one of the Four Cs entirely determined by human craftsmanship. It plays a defining role in a round diamond’s sparkle, beauty, and value.

Cutting a diamond is both a science and an art. Approximately 50% of the rough stone is lost in the process. Every facet must be in precise geometric relation to the others, and the culet must be centered. The diamond is then polished to stringent standards to reveal its full potential. It refers to the precise artistry of shaping a diamond using physics, advanced technology, and the skill of a trained cutter. Symmetry and proportions are key.

An excellent cut diamond optimizes the way light travels through it, maximizing sparkle, what we call fire and brilliance. Cut grades such as Excellent, Very Good, or Good help indicate how effectively a diamond reflects and returns light.

• Ideal Cut: Reflects light through the top of the diamond for maximum sparkle.
• Deep Cut: Loses light through the sides, making the diamond appear darker.
• Shallow Cut: Light escapes out the bottom, diminishing brilliance.

The GIA cut grade applies only to round brilliant diamonds, as it is the only shape with standardized proportions and measurements for evaluating light performance. Fancy shaped diamonds like ovals, cushions, emerald cuts, and pears do not receive an official cut grade, so assessing their beauty depends more on expert evaluation of proportions, symmetry, and craftsmanship.

Of the Four Cs, carat weight is the simplest factor to determine the value of a diamond. Carat is the unit of weight used for all gemstones. One carat equals 0.20 grams and is further divided into 100 points. For example, a diamond weighing 0.75 carats is 75 points.

Diamonds are precisely weighed before they are set into a ring or a piece of jewelry. While carat weight affects price, it’s not the only factor, two diamonds of the same weight can look and perform very differently depending on cut and proportions. Larger diamonds also tend to increase in price exponentially due to rarity.

A Lux Diamond is cut with uncompromising precision to achieve perfect proportions, symmetry, and polish, resulting in exceptional brilliance and the rare Hearts and Arrows pattern. Fewer than one in a million diamonds meets the standards to become a Lux Bond & Green Ideal Diamond, making it a true symbol of rarity and craftsmanship.

At Lux Bond & Green, we carry only natural diamonds because each is a rare treasure formed over billions of years beneath the Earth’s surface. Unlike lab-grown stones, natural diamonds are unique and finite, symbolizing timeless beauty and authenticity. Supporting natural diamonds also means supporting ethical mining practices that benefit communities and the environment.

Whether you’re shopping for an engagement ring, a special occasion, or simply want to deepen your understanding, Lux Bond & Green is here to help. Our experts are passionate about diamonds and even more passionate about sharing that knowledge with you.

Visit one of our stores or explore our curated diamond collections online. Let us guide you with care, transparency, and 127 years of trusted experience.