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Cushion|Lab Grown|IGI

1.20ct E VS1 Cushion Lab Grown Diamond

EX • E/VS1 • IGI LG805666656

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG805666656

Diamond specifications and retailer prices

From £174 GBP
$232 USD
As of October 29, 2026
Save £764 GBP (81%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £939 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.2ct lab-grown cushion diamond

This 1.2ct lab-grown cushion sits in the classic one-carat band, graded E colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG805666656 or 805666656. Listed at 16 retailers as of October 29, 2026, with prices from £174 to £939, a £764 spread on the same certified stone. Brilliant Earth lists it at £939. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.20
Carat
E
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38°
Pavilion angle38.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG805666656
Dimensions6.19 × 6.14 × 4.03 mm
L/W Ratio1.01
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
6.19 mm6.14 mm1.20 ctE / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG805666656
Side View
Table 64.0%Crown 38°Girdle: STK-THKPavilion 38.4°Culet: NoneDepth 65.6%

Caratlytics Score

How it works →
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: Oct 29
Current: £939 GBP|Low: £152 GBP|High: £939 GBP|Avg: £468 GBP|+11.6%
Brilliant Earth
Retailer 2
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Retailer 4
Retailer 5
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Retailer 7
Retailer 8
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Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 18
October 29, 2026
Retailer 13£174 GBP
Retailer 5£176 GBP
Retailer 15£213 GBP
Retailer 8£267 GBP
Retailer 12£287 GBP
Retailer 3£300 GBP
Retailer 11£305 GBP
Retailer 17£320 GBP
Retailer 9£416 GBP
Retailer 7£417 GBP
Retailer 6£430 GBP
Retailer 16£492 GBP
Retailer 18£510 GBP
Retailer 2£602 GBP
Retailer 14£796 GBP
Retailer 10£847 GBP
Retailer 4£853 GBP
Brilliant Earth£939 GBP

15 data points across 18 retailers

16 retailers£174 GBP to £939 GBP

A
Cheapest Retailer
-
£174 GBP
$232 USD
Final sale: no returns
A
Retailer 2
-
£176 GBP
$234 USD
View
A
Retailer 3
-
£213 GBP
View
A
Retailer 4
-
£287 GBP
€364 EUR
View
A
Retailer 5
-
£300 GBP
$399 USD
View
A
Retailer 6
-
£305 GBP
View
A
Retailer 7
-
£320 GBP
$426 USD
View
B+
Retailer 8
-
£417 GBP
$555 USD
View
B+
Retailer 9
-
£430 GBP
A$880 AUD
View
B+
Retailer 10
-
£481 GBP
$640 USD
View
B+
Retailer 11
-
£492 GBP
$655 USD
View
B+
Retailer 12
-
£510 GBP
A$1,045 AUD
View
B+
Retailer 13
-
£602 GBP
$801 USD
View
B
Retailer 14
-
£796 GBP
View
B
Retailer 15
-
£853 GBP
$1,136 USD
View
Most Expensive
B
Brilliant Earth
20079173A · Oct 29
£939 GBP
$1,250 USD
View
15 more retailers have this diamond
Prices start from £174 GBPSave up to £764 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
1.20ct Cushion
£174 GBP