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Round|Lab Grown|IGI

3.40ct I IF Round Lab Grown Diamond

EX • I/IF • IGI LG629429211

Shape and cutting style on the report: Round brilliant

Certificate IGI LG629429211

Diamond specifications and retailer prices

From £576 GBP
$772 USD
As of October 29, 2026
Save £2,297 GBP (80%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £2,873 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.4ct lab-grown round diamond

This 3.4ct lab-grown round sits in the three to five carat band, graded I colour (near-colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG629429211 or 629429211. Listed at 18 retailers as of October 29, 2026, with prices from £576 to £2,873, a £2,297 spread on the same certified stone. Brilliant Earth lists it at £2,873. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

3.40
Carat
I
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.7°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629429211
Dimensions9.72 × 9.70 × 5.85 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
9.72 mm9.70 mm3.40 ctI / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629429211
Side View
Table 57.0%Crown 32.7°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £2,873 GBP|Low: £553 GBP|High: £4,232 GBP|Avg: £1,526 GBP|-32.1%
Brilliant Earth
Retailer 2
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Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 17
October 31, 2026
Retailer 15£576 GBP
Retailer 4£627 GBP
Retailer 17£646 GBP
Retailer 16£669 GBP
Retailer 11£799 GBP
Retailer 3£957 GBP
Retailer 2£1,062 GBP
Retailer 13£1,097 GBP
Retailer 7£1,396 GBP
Retailer 10£1,552 GBP
Retailer 14£1,590 GBP
Retailer 8£1,867 GBP
Retailer 5£1,879 GBP
Retailer 6£2,081 GBP
Retailer 9£2,309 GBP
Retailer 12£2,509 GBP
Brilliant Earth£2,873 GBP

39 data points across 17 retailers

18 retailers£576 GBP to £2,873 GBP

A
Cheapest Retailer
-
£576 GBP
$772 USD
A
Retailer 2
-
£627 GBP
$840 USD
View
A
Retailer 3
-
£646 GBP
$865 USD
View
Final sale: no returns
Retailer 4
-
£669 GBP
$896 USD
View
Price last confirmed 14 days ago
A
Retailer 5
-
£669 GBP
$896 USD
View
A
Retailer 6
-
£799 GBP
$1,070 USD
View
A
Retailer 7
-
£957 GBP
$1,282 USD
View
A
Retailer 8
-
£1,062 GBP
€1,355 EUR
View
A
Retailer 9
-
£1,097 GBP
$1,470 USD
View
B+
Retailer 10
-
£1,396 GBP
$1,871 USD
View
B+
Retailer 11
-
£1,552 GBP
ZAR 33,595 ZAR
View
B+
Retailer 12
-
£1,590 GBP
$2,130 USD
View
B
Retailer 13
-
£1,867 GBP
$2,501 USD
View
B
Retailer 14
-
£1,879 GBP
$2,518 USD
View
B
Retailer 15
-
£2,081 GBP
View
B
Retailer 16
-
£2,309 GBP
$3,094 USD
View
B
Retailer 17
-
£2,509 GBP
View
Most Expensive
B
Brilliant Earth
10022222A · Oct 30
£2,873 GBP
$3,850 USD
View
17 more retailers have this diamond
Prices start from £576 GBPSave up to £2,297 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
3.40ct Round
£576 GBP