0.5 Carat Lab-Grown Diamonds
A 0.5 carat diamond, the half-carat, is the size most people start with: about 5.2 mm across as a round brilliant, 6.6 × 4.6 mm as an oval, and clearly visible on the hand without dominating it. Every stone on this page weighs 0.50–0.59 ct, is independently graded by IGI or GIA, and is shown with its live, VAT-inclusive price. Compare shapes below, see any stone true to size on a hand, and set it in a ring with our gemologists when you are ready.
IGI/GIA certified · Inspected in Sweden · Free insured shipping
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How big is a 0.5 carat diamond?
A 0.5 ct round brilliant measures about 5.2 mm in diameter. Carat is a unit of weight (0.5 ct is 0.1 g, or 50 points), so the visible size depends on the shape and on how deeply the stone is cut: a shallow, well-proportioned stone spreads wider than a deep one of the same weight, and elongated shapes such as oval, pear and marquise look larger still because their outline is longer. The table gives the typical face-up measurements of the 0.5 carat stones in our catalogue (median length × width, mm).
| Shape | Typical size of a 0.5 ct stone |
|---|---|
| Round | 5.2 mm |
| Oval | 6.6 × 4.6 mm |
| Pear | 7.2 × 4.5 mm |
| Marquise | 8.5 × 4.3 mm |
| Emerald | 5.6 × 3.8 mm |
| Radiant | 5.8 × 4.0 mm |
| Heart | 5.6 × 5.2 mm |
| Princess | 4.5 mm square |
| Asscher | 4.5 mm square |
On an average finger a 5.2 mm round covers roughly a third of the finger's width, which is why the half-carat reads as a proper centre stone rather than an accent, while still sitting low enough for daily wear. Open any product and use the "see it true to size" tool to check the proportions on your own hand.
0.5 carat diamond rings
The half-carat is the classic solitaire size because it works with almost any setting. A slim band of around 1.8 mm makes the stone the focus; a four-prong or six-prong solitaire shows the most light; a halo of small diamonds adds a ring of sparkle and can make the centre read like a stone a size or two larger; a bezel or a low-set basket keeps it discreet and snag-free. In an oval or pear cut, a 0.5 ct stone spreads across the finger the way a heavier round would, which is the most common way to get more visual size from the same budget. Every diamond here is loose: choose "Set this stone in a ring" on the product page, or design the whole piece in the ring configurator and our gemologists will set it for you.
How much does a 0.5 carat lab-grown diamond cost?
Prices on this page are live and include VAT, the grading report and insured delivery. Within the 0.50–0.59 ct range the price is set by colour, clarity and cut quality, and the spread between the most and least expensive half-carat stones is wide, so it pays to know what you are paying for. At this size an SI1 or VS2 stone is almost always clean to the naked eye and a G–H colour looks white once set, which is our Classic tier; F colour with VS clarity (Reserve) is the step up for a stone that stays colourless next to platinum; D–E with VVS clarity (Signature) is for those who want the top of every scale. Because diamond prices rise per carat with weight, a 0.5 ct stone costs far less than half of a comparable 1 ct, and a lab-grown stone typically costs 60–80% less than a mined stone of the same grade. If you are weighing lab-grown against mined, start with our guide to lab-grown diamonds.
Choosing a 0.5 carat diamond
- Cut quality is the biggest lever. Filter for Excellent cut, polish and symmetry; a well-cut half-carat looks brighter and slightly larger than a poorly cut one.
- Clarity: SI1–VS2. Inclusions in a 5 mm stone are tiny; VVS is a preference, not a need.
- Colour: G–H for value, D–F for white gold and platinum. Browse near-colourless VS stones for the sweet spot, or colourless VS stones if you want an icy look.
- Shape sets the personality. Round for maximum brilliance, oval and pear for spread and a lengthening effect on the finger, emerald for a clean, architectural look.
Compare nearby sizes
A 0.4 carat diamond is about 0.3 mm smaller as a round and noticeably more delicate; a 0.7 carat diamond is about 5.8 mm and is the next clear step up in presence; a 1 carat diamond is about 6.5 mm. Browse all sizes, shapes and grades together in the diamond search, or see our engagement rings.
0.5 carat diamonds: frequently asked questions
How many mm is a 0.5 ct diamond?
About 5.2 mm in diameter for a round brilliant. Ovals measure roughly 6.6 × 4.6 mm, pears 7.2 × 4.5 mm, emerald cuts 5.6 × 3.8 mm and princess cuts 4.5 mm square. The exact measurements of every stone are on its certificate and product page.
Is a 0.5 carat diamond a good size for an engagement ring?
Yes. The half-carat is one of the most popular engagement sizes: large enough to be an unmistakable centre stone, small enough to sit low and wear comfortably every day. If you want more presence, choose an elongated shape or a halo setting rather than a heavier stone.
What is 0.5 carat in points and grams?
50 points, or 0.1 g. Stones on this page weigh between 0.50 and 0.59 ct, so between 50 and 59 points.
Does a 0.5 carat diamond look small?
Not on most hands. A 5.2 mm round covers roughly a third of an average finger's width. What makes a half-carat look small is usually a deep cut, a heavy setting or a wide band, all of which you can avoid. Use the true-to-size tool on any product to judge it on your own finger before you buy.
Is a lab-grown 0.5 carat diamond real?
Yes. A lab-grown diamond is a diamond, with the same crystal structure, hardness and brilliance as a mined stone. Every stone here is graded by IGI or GIA, its report states that it is laboratory-grown, and it is inspected in Sweden before it ships.
Questions, answered
What 0.5 carat lab-grown diamonds do you offer?
Our 0.5 carat lab-grown diamonds selection features 188 certified lab-grown diamonds in stock right now, each independently graded by IGI or GIA and hand-inspected in Sweden before it ships.
Are lab-grown diamonds real diamonds?
Yes. A lab-grown diamond is a real diamond — chemically, physically and optically identical to a mined one. The only difference is origin: it is grown above ground in a matter of weeks instead of mined over millennia, typically 60–80% less than the mined equivalent.
How are your diamonds certified?
Every stone is independently graded by IGI or GIA and ships with its certificate. You can verify the report number directly on the lab's public website.
Are these diamonds conflict-free?
Yes. Because they are lab-grown, our diamonds are entirely conflict-free and traceable, with a far lower environmental footprint than mined stones.
Can I return a diamond or set it in a ring?
Yes. Every order includes free insured shipping and 30-day returns. Each stone is loose and ready to set — choose "Set this stone in a ring" on any product and our gemologists help you build the setting.
