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Cushion|Lab Grown|IGI

3.80ct E SI1 Cushion Lab Grown Diamond

GD • E/SI1 • IGI LG655438364

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG655438364

Diamond specifications and retailer prices

From £395 GBP
$529 USD
As of October 28, 2026
Save £2,725 GBP (87%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £3,120 GBP at Kay Jewelers · As of October 26, 2026
View at Kay Jewelers

About this 3.8ct lab-grown cushion diamond

This 3.8ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG655438364 or 655438364. Listed at 7 retailers as of October 26, 2026, with prices from £395 to £3,120, a £2,725 spread on the same certified stone. Kay Jewelers lists it at £3,120. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

3.80
Carat
E
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG655438364
Dimensions9.05 × 8.98 × 6.08 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.05 mm8.98 mm3.80 ctE / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG655438364
Side View
Table 61.0%Crown 35.1°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 67.7%

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: Oct 28
Current: £3,120 GBP|Low: £272 GBP|High: £3,127 GBP|Avg: £1,575 GBP
Kay Jewelers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 28, 2026
Retailer 9£395 GBP
Retailer 4£601 GBP
Retailer 6£655 GBP
Retailer 2£657 GBP
Retailer 11£784 GBP
Retailer 12£810 GBP
Retailer 8£1,425 GBP
Retailer 10£1,544 GBP
Retailer 5£1,928 GBP
Retailer 3£2,486 GBP
Retailer 7£2,993 GBP
Kay Jewelers£3,120 GBP

19 data points across 12 retailers

7 retailers£395 GBP to £3,120 GBP

A
Cheapest Retailer
-
£395 GBP
$529 USD
Final sale: no returns
B+
Retailer 2
-
£655 GBP
$877 USD
View
B+
Retailer 3
-
£657 GBP
$880 USD
View
B
Retailer 4
-
£1,425 GBP
$1,910 USD
View
B
Retailer 5
-
£1,928 GBP
View
B
Retailer 6
-
£2,993 GBP
$4,010 USD
View
Most Expensive
C
Kay Jewelers
252769047 · Oct 26
£3,120 GBP
$4,180 USD
View
6 more retailers have this diamond
Prices start from £395 GBPSave up to £2,725 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
3.80ct Cushion
£395 GBP