Natural Diamonds: The 4 Cs to Choose Well (Guide)

When buying a diamond, everyone talks about "the 4 Cs". It sounds technical, but it's simple and helps you spend your budget well. Here it is in plain terms, from a workshop that works only with certified natural diamonds.

The 4 Cs

1. Cut — the most important

It's how the diamond is cut, and it's what makes it sparkle. An excellently cut diamond returns light like a mirror; a poorly cut one looks dull even if large. If you must prioritise one C, prioritise cut.

2. Colour

Graded from D (colourless, purest) downward. The more colourless, the cleaner it looks. Tip: in yellow or rose gold you can drop a little colour without it showing, and save.

3. Clarity

The diamond's tiny natural inclusions. Many aren't visible to the naked eye. You don't need maximum clarity — "eye-clean" is enough.

4. Carat

The weight (size). Price rises non-linearly: just under the round weights (0.90 instead of 1.00 ct) usually offers great value.

How to prioritise on a budget

Our usual recipe: excellent cut + eye-clean clarity + colour balanced with the metal + the size your budget allows. That gets you maximum sparkle for your money.

Why certified and natural

An independent certificate guarantees what you're buying. And at Arelana we work exclusively with natural diamonds: finite, irreplaceable and better at holding value — which makes sense for a lifelong piece.

Frequently asked questions

Which C matters most?
Cut. It affects sparkle the most.

Do I need maximum clarity and colour?
No. Eye-clean and a colour balanced with the metal look perfect and save money.

Are all your diamonds natural?
Yes, natural and certified.

Choose your diamond with us

We show you natural diamond options for your custom engagement ring.
📞 +34 699 522 557 (WhatsApp) · Request your quote · Barcelona.