Finding the diamond that's right for you.
For most, the diamond journey starts with a simple but meaningful goal: finding the perfect gem for a moment that matters. But the diamond world can be overwhelming, and not every article you read online helps.
As someone who started as a diamond trader in Antwerp, became a certified gemologist, and spent over a decade designing engagement rings, I’ve come to understand what really matters. I’ve handled thousands of diamonds, and sat across hundreds of clients, each with their own idea of “perfect.”
So let me walk you through the essentials: the 4Cs—Colour, Clarity, Cut, and Carat—with the honest insights I give my own clients.
To make things clearer, here’s a simple visual guide to the 4Cs, as outlined by the International Gemological Institute (IGI). It’s a helpful way to visualise what I’ll be explaining next.
Colour Grade
Diamonds are graded from D (colourless) to Z (noticeably yellow or brown). D to F are the purest whites, but G and H offer exceptional whiteness to the naked eye, even when set in white metal like platinum or white gold. These are the most popular grades for good reason: they look great and offer better value.
If you’re going with yellow or rose gold, consider I-J grade. Their subtle warmth blends beautifully with these metals, often making the stone appear whiter by contrast.
It’s important to know that grading colour is done face-down on a white tray under controlled white lighting. Once set in a ring, the difference between a D and a G is barely noticeable. So don’t pay a premium for what the eye can’t see.
Clarity Grade
Clarity refers to inclusions, natural imperfections inside or on the surface of the diamond. GIA grades range from Flawless (FL) down to Included (I1–I3).
- IF (Internally Flawless) and VVS1–VVS2 (Very Very Slightly Included) are top-tier grades. Under 10x magnification, they’re nearly spotless. A microscope is needed to really spot them.
- VS1–VS2 (Very Slightly Included) are what I often recommend, they’re usually clean to the naked eye, and more price competitive.
- Shapes like emerald or asschers cuts, which have large open facets and tables, may require a higher clarity since inclusions are more visible.
Be mindful: not all VS2 diamonds are created equal. Some might still show visible marks depending on the type and location of inclusions. That’s why I always request actual videos or photos. If you want peace of mind, ask a gemologist to review the stone, not just the certificate.
Cut Grade
Cut is what brings a diamond to life. It’s the only C that is entirely dependent on craftsmanship.
Cut affects brilliance, fire, and sparkle, and includes the angles, proportions, polish, and symmetry of the diamond. GIA grades Cut from Excellent down to Poor, but only for round brilliant diamonds (as they’ve standardised that shape fully). For other shapes, like ovals or cushions, there’s no GIA Cut grade, so visual inspection is even more important.
I recommend sticking to Excellent or Very Good cut grades, especially if you want that lively, radiant look. When in doubt, always ask to see a video or image before deciding.
Carat Weight
Carat is the diamond’s weight, not size/dimensions. One carat = 0.20 grams. But how big a diamond looks depends on more than just its carat. Two diamonds with the same carat weight can still differ in size very slightly, depending on how deep or shallow they’ve been cut. A well-cut diamond stays within an ideal depth percentage, allowing light to reflect properly and create that signature sparkle. If the cut is too deep or too shallow, the diamond may appear dull, dark, or simply lack the brilliance it’s meant to have.
There are also price jumps at common milestones: 0.50ct, 1.00ct, 1.50ct, etc. Sometimes a 0.90ct stone will look nearly the same as a 1ct but cost quite less. If you’re open to a slightly “off” weight, you’ll often get more value.
Fluorescence
Some diamonds fluoresce under UV light, usually with a soft blue glow. This is not a defect. In fact, most diamonds have some degree of fluorescence.
Only 2–5% of diamonds with Strong fluorescence might appear cloudy in sunlight. The rest look completely normal. That said, if you’re buying without expert advice, stick to None to Faint fluorescence for peace of mind.
When I’m sourcing for clients, I personally verify that fluorescence doesn’t affect the look of the stone, even if it’s Medium or Strong. It’s just part of the job.
Certification
A diamond certificate is its passport. Always ask for one. I recommend GIA (Gemological Institute of America) as it’s the most respected lab globally, and the one trusted most on resale.
For lab-grown diamonds, I also trust IGI (International Gemological Institute). They offer consistency in their reports.
Final Thoughts
You don’t need to chase the highest grades or spend unnecessarily to get a beautiful diamond. The secret lies in knowing what actually shows to the eye, how to balance the 4Cs, and having someone you trust to guide you.
Many jewelers don’t have a gemology background, or they may be tied to specific stock. I source directly from diamond manufacturers around the world, and each stone is chosen with care. Quality, emotion, and value must all align.
So if you’re just starting your diamond journey, or if you’ve been searching and still haven’t found the one, feel free to get in touch. I’d be honoured to help you find your perfect stone.
Patrick
GIA Gemologist | Diamond Trader | Jewelry Designer
