April Birthstone: Diamond
The April birthstone is the diamond — the hardest natural stone we work with, and the same stone most people choose for an engagement ring. Here's what it means, how it's graded, and how to choose one.
Key Takeaways
- The modern and traditional birthstone for April is the diamond, confirmed by both the GIA and the American Gem Society.
- Diamond is the hardest natural material known, scoring a perfect 10 on the Mohs hardness scale (Britannica).
- The same toughness that makes diamond the April stone also makes it the standard engagement-ring stone — it stands up to daily wear better than any other gem.
- Diamond quality is judged by the 4Cs — cut, colour, clarity and carat weight — a grading system the GIA developed in the 1950s and the trade still uses today.
- Diamond is also the gift for the 60th and 75th wedding anniversaries.
What is the April birthstone?
The April birthstone is the diamond. There's no modern-versus-traditional split to worry about here the way there is for some months — both the GIA and the American Gem Society name diamond for April on every chart. If you were born in April, the diamond is your stone, full stop.
The name comes from the Greek word adamas, meaning invincible or unbreakable, which fits. Diamond is made entirely of carbon, with each atom locked to four neighbours in a tight three-dimensional grid. That structure is why it sits at the very top of the Mohs hardness scale at a 10 — nothing in nature scratches a diamond except another diamond.
What does the diamond mean?
Most of the meaning attached to diamond comes straight from that hardness. Across cultures it's been read as a symbol of strength, clarity, and a bond that doesn't wear down — which is exactly why it ended up on the engagement-ring finger. For an April birthday it carries the same idea: a stone that lasts, the way you'd want a year, a relationship, or a life to last.
One small but practical point we tell customers on our Coquitlam bench: hardness is not the same thing as toughness. A diamond resists scratching better than anything, but a sharp knock on a thin girdle can still chip it. So "unbreakable" is a nice story, not a wearing instruction. We set engagement diamonds with that in mind.
Why diamond doubles as the engagement stone
People sometimes ask whether wearing a diamond as a birthstone "uses up" its meaning as an engagement stone. It doesn't — they're the same property pulling double duty. An engagement ring gets worn every single day, through dishwater, gym bars, car doors and gardening. You want the one gem that shrugs that off, and diamond's 10 on the Mohs scale is the reason it became the default. A softer stone in the same daily role would show scratches within a year.
That's also why a diamond makes such a sensible April gift even when there's no proposal involved. Whatever you set it into — a pendant, studs, a ring — it'll look the same in twenty years as it does the day you buy it, with nothing more than the occasional clean.
The 4Cs, in plain English
Diamonds are graded on four things the trade calls the 4Cs. The GIA built this system in the 1950s and it's now the universal language for describing a stone. Here's what each one actually means when you're standing at the counter.
| The C | What it measures | Quick guide |
|---|---|---|
| Cut | How well the facets are proportioned to bounce light back to your eye | The biggest driver of sparkle. Graded Excellent to Poor by GIA — don't skimp here. |
| Colour | How colourless the stone is | Graded D (colourless) to Z (light yellow) on the GIA D-to-Z scale. |
| Clarity | How free it is of tiny internal marks (inclusions) and surface marks | Flawless down to Included on the GIA clarity scale. Many inclusions are invisible without magnification. |
| Carat | The stone's weight | One carat equals 200 milligrams. Weight, not size — two stones of equal carat can look different depending on cut. |
If you only remember one thing, make it cut. A well-cut diamond of modest colour and clarity outshines a sloppily cut stone with better paper grades every time, because cut is what creates the brightness people actually notice. We'd rather sell you a beautifully lively stone than a bigger, duller one.
Choosing a diamond gift for an April birthday
You don't need a proposal to give a diamond. For a milestone birthday, diamond stud earrings are the easiest win — they suit anyone, get worn constantly, and you never have to guess a ring size. A solitaire pendant is the next safest choice. If you do know the size and the style, a diamond ring set as a "right-hand ring" (worn for its own sake, not as an engagement piece) is a lovely April gift.
Shape is where personality comes in — round brilliant, oval, emerald cut, pear and so on all read very differently on the hand. It's worth understanding the trade-offs before you choose, so have a look at our Diamond Shapes guide before settling on one. And because diamond is the 60th- and 75th-anniversary stone too, the same piece works as a major anniversary gift down the line.
Whatever you pick, we cut, set and size it on-site at our Coquitlam studio, so the stone you choose and the finished piece are handled under one roof.
How April compares to nearby months
April is one of the simpler months — a single, universally agreed stone. Some neighbouring months are split between a modern and a traditional choice, so if you're shopping for a family member born around April, it's worth checking the right month. You can compare them all in our parent Birthstones by Month: Modern & Traditional Stones hub, or jump to a specific one: January's garnet, February's amethyst, or March's aquamarine. For the geology and care side of every stone we work with, our full gemstone guide goes deeper.
Frequently Asked Questions
What is the birthstone for April?
The April birthstone is the diamond. It's listed as both the modern and traditional stone for April by the GIA and the American Gem Society, so there's no separate alternative to choose between.
Is the April birthstone always a diamond, or is there an alternative?
Diamond is the standard April stone on every major birthstone chart. Some retailers offer white sapphire or white topaz as lower-cost stand-ins because they look similar, but the recognised birthstone for April is the diamond.
Why is diamond used for both birthstones and engagement rings?
It comes down to durability. Diamond scores a 10 on the Mohs hardness scale, the highest possible, which means it resists scratching better than any other gem and holds up to daily wear. That's why it became the default engagement stone, and the same quality makes it a lasting birthstone gift.
What are the 4Cs of a diamond?
The 4Cs are cut, colour, clarity and carat weight — the grading system the GIA created in the 1950s to describe diamond quality. Cut measures how well the stone returns light, colour measures how colourless it is, clarity measures internal and surface marks, and carat measures weight. Cut has the biggest effect on how much a diamond sparkles.
Which anniversary is the diamond for?
Diamond is the traditional gift for the 60th and 75th wedding anniversaries, in addition to being the April birthstone, according to the GIA.
Can a diamond chip even though it's the hardest stone?
Yes. Hardness means resistance to scratching, not resistance to breaking. A diamond won't scratch in normal wear, but a hard knock on a thin edge can chip it. A good setting protects the vulnerable points, which is something we account for when we set stones on our bench.