4C's of Diamond | Radiant Jewels | Sydney

No Two Diamonds Are the Same — That’s the Beauty of It

Just like every love story is unique, so is every diamond. The subtle variations in each stone’s shape, sparkle, and fire create a one-of-a-kind brilliance — whether you choose a natural diamond or a lab-grown diamond.

At Radiant Jewels, we work exclusively with GIA and IGI certified diamonds, offering complete transparency and quality assurance. These globally recognised gemological laboratories assess diamonds using a universal grading system known as the 4Cs — Cut, Colour, Clarity, and Carat — to determine a diamond’s beauty and value.

Why the 4Cs Matter When Buying a Diamond ?

Whether you're selecting an engagement ring, a wedding band, or a custom-designed diamond jewelry piece, understanding the 4Cs is key to making a confident and informed choice. These characteristics affect not just how your diamond looks, but also how much it’s worth.

When purchasing diamonds online or in person, especially for high-value pieces like engagement rings, the 4Cs help you go beyond first impressions. A diamond may appear radiant in a photo, but its true quality lies in the details — and that’s where certification matters.

Let’s explore what the 4Cs really mean and how each plays a role in crafting your forever piece.

Colour

The color grade of a diamond ranges from D (colorless) to Z (light yellow or brown). The closer to colorless a diamond is, the more rare and valuable it becomes. A diamond’s color can greatly influence its overall appearance, so choosing a stone with minimal color will ensure your gem remains dazzlingly pure.

Clarity

Clarity refers to the presence of internal or external imperfections, known as inclusions and blemishes. Diamonds with high clarity grades are those that appear flawless or nearly so, allowing light to pass through without obstruction. A diamond’s clarity enhances its overall brilliance, making it a true gem of unparalleled perfection.

Cut

The cut of a diamond is the art of shaping and faceting the stone to maximize its brilliance and sparkle. It’s not just about the shape but how well the diamond reflects light. A superior cut will make your diamond dazzle and shimmer with unmatched fire, capturing hearts and catching every eye.

Carat

Carat weight measures the size of the diamond. Larger diamonds are rarer and typically more sought after, but remember, the beauty of a diamond is also about its proportion and how the other Cs complement it. A well-cut diamond with high clarity and color will shine magnificently, regardless of carat weight.