0.7 Carat Lab-Grown Diamonds
A 0.7 carat diamond is the engagement-ring size that sits between the half-carat and the full carat: about 5.8 mm across as a round brilliant, and 7.3 × 5.1 mm as an oval, whose length exceeds the diameter of a 1 ct round. Every stone on this page weighs 0.70–0.79 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.
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How big is a 0.7 carat diamond?
A 0.7 ct round brilliant measures about 5.8 mm in diameter, roughly 0.6 mm more than a half-carat and 0.7 mm less than a full carat. Because carat is weight (0.7 ct is 0.14 g, or 70 points), the face-up size varies with shape and cut depth, and the elongated cuts make the most of it: a 0.7 ct oval is about 7.3 mm long and a pear about 8.1 mm, both longer than the 6.5 mm diameter of a 1 ct round. The table shows the typical face-up measurements of the 0.7 carat stones in our catalogue (median length × width, mm).
| Shape | Typical size of a 0.7 ct stone |
|---|---|
| Round | 5.8 mm |
| Oval | 7.3 × 5.1 mm |
| Pear | 8.1 × 5.0 mm |
| Marquise | 9.4 × 4.7 mm |
| Emerald | 6.2 × 4.3 mm |
| Radiant | 6.4 × 4.5 mm |
| Heart | 6.3 × 5.7 mm |
| Princess | 4.9 mm square |
| Asscher | 5.0 mm square |
On the hand, a 0.7 ct stone is clearly a centre stone from across a room, while still sitting low enough on a slim band to wear every day. Open any product and use the "see it true to size" tool to compare it with a 0.5 ct and a 1 ct on your own finger.
0.7 carat diamond rings
This is the size where the engagement-ring classics come into their own. A 0.7 ct round in a six-prong solitaire on a 1.8–2 mm band is the timeless choice; the same stone in a slim halo reads close to a full carat; a bezel makes a clean, contemporary ring that never snags. The 0.7 ct oval is a combination many people ask for, and for good reason: its length makes the finger look longer and its face-up area rivals a heavier round, so it is the usual answer when the brief is "as big as possible without going to 1 ct". Pears and marquises do the same with a more distinctive outline. Every diamond here is loose and ready to set: choose "Set this stone in a ring" on the product page or build the whole ring in the ring configurator, and our gemologists will take it from there.
How much does a 0.7 carat lab-grown diamond cost?
Prices on this page are live and include VAT, the grading report and insured delivery. Within the 0.70–0.79 ct range, colour, clarity and cut set the price. At this size inclusions start to become easier to spot than in a half-carat, so VS2 and above is the safer floor for a stone that is clean to the naked eye; SI1 stones can still be eye-clean, but check the certificate plot and the photograph, which is why we inspect and photograph every stone in Sweden before dispatch. On colour, G–H still looks white in yellow or rose gold; for white gold or platinum, F and above keeps the stone colourless against the metal. Our tiers make the trade-off simple: Classic (G–H, SI), Reserve (F, VS) and Signature (D–E, VVS). Prices step up at the 1.00 ct mark, so a 0.7 ct stone of a higher grade often costs less than a 1 ct stone of a lower one, and either way a lab-grown stone typically costs 60–80% less than its mined equivalent. Read more in our guide to lab-grown diamonds.
Choosing a 0.7 carat diamond
- Cut before everything. Filter for Excellent cut, polish and symmetry; it is the difference between a stone that sparkles across the room and one that looks flat.
- Clarity: VS2 or better as a rule, SI1 if the plot is clean.
- Colour by metal. Near-colourless G–H for yellow and rose gold, colourless D–F for platinum and white gold.
- Shape for spread. Oval, pear and marquise give the most visible size; round gives the most brilliance; emerald and radiant give a rectangular outline.
Compare nearby sizes
A 0.5 carat diamond is about 5.2 mm as a round; a 0.8 carat or 0.9 carat diamond gets you close to the look of a full carat at a lower price; a 1 carat diamond is about 6.5 mm. Browse all sizes together in the diamond search, or see our engagement rings.
0.7 carat diamonds: frequently asked questions
How many mm is a 0.7 carat diamond?
About 5.8 mm in diameter as a round brilliant. A 0.7 ct oval measures roughly 7.3 × 5.1 mm, a pear 8.1 × 5.0 mm, an emerald cut 6.2 × 4.3 mm and a princess cut 4.9 mm square. Exact measurements are on each certificate and product page.
Is a 0.7 carat diamond a good size for an engagement ring?
Yes. It is a classic engagement size: unmistakably a centre stone, comfortable for daily wear, and noticeably larger than a half-carat without the price step of a full carat. In an oval or pear cut it has a face-up size that rivals many 1 ct rounds.
What does a 0.7 carat oval diamond ring look like?
A 0.7 ct oval measures about 7.3 mm long by 5.1 mm wide, so it runs along the finger rather than across it, which makes the finger look longer and the stone look larger than its weight suggests. It suits a slim band with a four-prong setting, and looks especially large in a thin halo. Use the true-to-size tool on any oval to see it on a hand.
Is 0.7 ct the same as three-quarters of a carat?
Close: 0.75 ct is exactly three-quarters of a carat. Stones on this page weigh 0.70–0.79 ct, so some are just under and some just over three-quarters. All sit between the half-carat and the full carat in both size and price.
Is a lab-grown 0.7 carat diamond real?
Yes. It is a diamond with the same crystal structure, hardness and brilliance as a mined stone. Every 0.7 ct diamond 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 0.7 carat lab-grown diamonds do you offer?
Our 0.7 carat lab-grown diamonds selection features 195 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.
