CaratHunter
Plans
Radiant|Lab Grown|IGI

1.18ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG729590710

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG729590710

Diamond specifications and retailer prices

From £146 GBP
As of November 4, 2026
Save £1,091 GBP (88%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,237 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.18ct lab-grown radiant diamond

This 1.18ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG729590710 or 729590710. Listed at 21 retailers as of November 4, 2026, with prices from £146 to £1,237, a £1,091 spread on the same certified stone. Brilliant Earth lists it at £1,237. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.18
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.4°
Pavilion angle37.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG729590710
Dimensions10.37 × 7.13 × 4.39 mm
L/W Ratio1.45
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
10.37 mm7.13 mm1.18 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729590710
Side View
Table 65.0%Crown 47.4°Girdle: Slightly ThickPavilion 37.3°Culet: NoneDepth 72.1%

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: Nov 4
Current: £1,237 GBP|Low: £140 GBP|High: £2,059 GBP|Avg: £481 GBP|-39.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
November 4, 2026
Retailer 4£146 GBP
Retailer 18£163 GBP
Retailer 10£170 GBP
Retailer 5£181 GBP
Retailer 12£181 GBP
Retailer 17£303 GBP
Retailer 15£313 GBP
Retailer 7£316 GBP
Retailer 2£327 GBP
Retailer 9£361 GBP
Retailer 14£441 GBP
Retailer 13£469 GBP
Retailer 8£531 GBP
Retailer 6£582 GBP
Retailer 11£621 GBP
Retailer 20£641 GBP
Retailer 3£684 GBP
Retailer 16£847 GBP
Retailer 19£1,011 GBP
Brilliant Earth£1,237 GBP

43 data points across 20 retailers

21 retailers£146 GBP to £1,237 GBP

A
Cheapest Retailer
-
£146 GBP
A
Retailer 2
-
£163 GBP
View
Final sale: no returns
A
Retailer 3
-
£170 GBP
View
A
Retailer 4
-
£181 GBP
View
Retailer 5
-
£181 GBP
View
Price last confirmed 10 days ago
A
Retailer 6
-
£303 GBP
View
A
Retailer 7
-
£313 GBP
View
A
Retailer 8
-
£316 GBP
View
A
Retailer 9
-
£327 GBP
View
A
Retailer 10
-
£361 GBP
View
A
Retailer 11
-
£441 GBP
View
A
Retailer 12
-
£469 GBP
View
B+
Retailer 13
-
£531 GBP
View
B+
Retailer 14
-
£582 GBP
View
B+
Retailer 15
-
£621 GBP
View
B+
Retailer 16
-
£641 GBP
View
B+
Retailer 17
-
£677 GBP
View
B+
Retailer 18
-
£847 GBP
View
Retailer 19
-
£1,011 GBP
View
Price last confirmed 14 days ago
Retailer 20
-
£1,204 GBP
View
Most Expensive
B
Brilliant Earth
21417298A · Nov 4
£1,237 GBP
$1,670 USD
View
20 more retailers have this diamond
Prices start from £146 GBPSave up to £1,091 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
1.18ct Radiant
£146 GBP