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Cushion|Lab Grown|IGI

3.03ct E SI1 Cushion Lab Grown Diamond

VG • E/SI1 • IGI LG840612390

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG840612390

Diamond specifications and retailer prices

From £353 GBP
HK$3,700 HKD
As of October 31, 2026
Save £1,572 GBP (82%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,926 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.03ct lab-grown cushion diamond

This 3.03ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG840612390 or 840612390. Listed at 10 retailers as of October 29, 2026, with prices from £353 to £1,926, a £1,572 spread on the same certified stone. Brilliant Earth lists it at £1,926. 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

3.03
Carat
E
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle30.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840612390
Dimensions10.37 × 7.37 × 4.65 mm
L/W Ratio1.41
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.37 mm7.37 mm3.03 ctE / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840612390
Side View
Table 57.0%Crown 35.2°Girdle: MED-STKPavilion 30.4°Culet: NoneDepth 63.1%

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: Oct 31
Current: £492 GBP|Low: £290 GBP|High: £1,485 GBP|Avg: £621 GBP|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 10£290 GBP
Retailer 5£353 GBP
Retailer 7£397 GBP
Retailer 9£489 GBP
Retailer 1£492 GBP
Retailer 8£519 GBP
Retailer 4£576 GBP
Retailer 2£743 GBP
Retailer 3£786 GBP
Retailer 6£1,470 GBP

24 data points across 10 retailers

10 retailers£353 GBP to £1,926 GBP

A
Cheapest Retailer
-
£353 GBP
HK$3,700 HKD
Retailer 2
-
£397 GBP
View
Price last confirmed 14 days ago
B+
Retailer 3
-
£489 GBP
$655 USD
View
A
Retailer 4
-
£492 GBP
€628 EUR
View
B
Retailer 5
-
£519 GBP
$695 USD
View
A
Retailer 6
-
£576 GBP
View
B+
Retailer 7
-
£743 GBP
$996 USD
View
B+
Retailer 8
-
£786 GBP
$1,053 USD
View
B
Retailer 9
-
£1,470 GBP
$1,970 USD
View
Most Expensive
B
Brilliant Earth
21823147A · Oct 29
£1,926 GBP
$2,580 USD
View
9 more retailers have this diamond
Prices start from £353 GBPSave up to £1,572 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
3.03ct Cushion
£353 GBP