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Radiant|Lab Grown|IGI

1.31ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG780636936

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

Certificate IGI LG780636936

Diamond specifications and retailer prices

From £193 GBP
As of November 4, 2026
Save £1,770 GBP (90%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £1,963 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.31ct lab-grown radiant diamond

This 1.31ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780636936 or 780636936. Listed at 23 retailers as of November 4, 2026, with prices from £193 to £1,963, a £1,770 spread on the same certified stone. Brilliant Earth lists it at £1,963. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.31
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.4°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780636936
Dimensions7.78 × 5.35 × 3.60 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
7.78 mm5.35 mm1.31 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780636936
Side View
Table 63.0%Crown 46.4°Girdle: Slightly ThickPavilion 34.3°Culet: NoneDepth 67.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £1,963 GBP|Low: £193 GBP|High: £2,104 GBP|Avg: £621 GBP|-6.7%
Brilliant Earth
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November 4, 2026
Retailer 6£193 GBP
Retailer 9£215 GBP
Retailer 21£223 GBP
Retailer 4£239 GBP
Retailer 10£239 GBP
Retailer 5£265 GBP
Retailer 20£356 GBP
Retailer 18£393 GBP
Retailer 11£398 GBP
Retailer 17£412 GBP
Retailer 8£427 GBP
Retailer 2£451 GBP
Retailer 13£585 GBP
Retailer 3£657 GBP
Retailer 22£733 GBP
Retailer 7£767 GBP
Retailer 15£770 GBP
Retailer 16£804 GBP
Retailer 12£925 GBP
Retailer 19£961 GBP
Retailer 14£1,025 GBP
Retailer 23£1,367 GBP
Brilliant Earth£1,963 GBP

40 data points across 23 retailers

23 retailers£193 GBP to £1,963 GBP

A
Cheapest Retailer
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£193 GBP
A
Retailer 2
-
£215 GBP
View
Final sale: no returns
A
Retailer 3
-
£223 GBP
View
Retailer 4
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£239 GBP
View
Price last confirmed 10 days ago
A
Retailer 5
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£239 GBP
View
A
Retailer 6
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£265 GBP
View
A
Retailer 7
-
£356 GBP
View
A
Retailer 8
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£393 GBP
View
A
Retailer 9
-
£398 GBP
View
A
Retailer 10
-
£412 GBP
View
A
Retailer 11
-
£427 GBP
View
A
Retailer 12
-
£451 GBP
View
A
Retailer 13
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£585 GBP
View
B+
Retailer 14
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£657 GBP
View
B+
Retailer 15
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£733 GBP
View
B+
Retailer 16
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£767 GBP
View
B+
Retailer 17
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£770 GBP
View
B+
Retailer 18
-
£804 GBP
View
B+
Retailer 19
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£925 GBP
View
B+
Retailer 20
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£961 GBP
View
B
Retailer 21
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£1,025 GBP
View
Retailer 22
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£1,367 GBP
View
Price last confirmed 14 days ago
Most Expensive
B
Brilliant Earth
19067170A · Nov 4
£1,963 GBP
$2,650 USD
View
22 more retailers have this diamond
Prices start from £193 GBPSave up to £1,770 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
1.31ct Radiant
£193 GBP