CaratHunter
Plans
Cushion|Lab Grown|IGI

1.31ct F IF Cushion Lab Grown Diamond

ID • F/IF • IGI LG816655903

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG816655903

Diamond specifications and retailer prices

From £356 GBP
As of November 6, 2026
Save £873 GBP (71%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,229 GBP at Rare Carat · As of November 1, 2026
View at Rare Carat

About this 1.31ct lab-grown cushion diamond

This 1.31ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816655903 or 816655903. Listed at 5 retailers as of November 1, 2026, with prices from £356 to £1,229, a £873 spread on the same certified stone. Rare Carat lists it at £1,229. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.31
Carat
F
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle34.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816655903
Dimensions7.72 × 5.49 × 3.55 mm
L/W Ratio1.41
Girdle conditionFaceted
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
7.72 mm5.49 mm1.31 ctF / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816655903
Side View
Table 65.0%Crown 36.3°Girdle: THN-STKPavilion 34.5°Culet: NoneDepth 64.7%

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 6
Current: £1,229 GBP|Low: £356 GBP|High: £1,853 GBP|Avg: £851 GBP
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 5£356 GBP
Retailer 4£392 GBP
Retailer 2£572 GBP
Retailer 3£838 GBP
Rare Carat£1,229 GBP
Retailer 6£1,853 GBP

22 data points across 6 retailers

5 retailers£356 GBP to £1,229 GBP

A
Cheapest Retailer
-
£356 GBP
A
Retailer 2
-
£392 GBP
View
A
Retailer 3
-
£572 GBP
View
A
Retailer 4
-
£838 GBP
View
Most Expensive
B+
Rare Carat
ME-738-167 · Nov 1
£1,229 GBP
$1,645 USD
View
4 more retailers have this diamond
Prices start from £356 GBPSave up to £873 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 Cushion
£356 GBP