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Cushion|Lab Grown|IGI

3.50ct E SI1 Cushion Lab Grown Diamond

VG • E/SI1 • IGI LG807652606

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG807652606

Diamond specifications and retailer prices

From £430 GBP
HK$4,500 HKD
As of October 31, 2026
Save £1,637 GBP (79%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,067 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.5ct lab-grown cushion diamond

This 3.5ct 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 LG807652606 or 807652606. Listed at 13 retailers as of October 30, 2026, with prices from £430 to £2,067, a £1,637 spread on the same certified stone. Brilliant Earth lists it at £2,067. 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

3.50
Carat
E
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle29.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG807652606
Dimensions10.68 × 7.54 × 4.74 mm
L/W Ratio1.42
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.68 mm7.54 mm3.50 ctE / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG807652606
Side View
Table 67.0%Crown 36.4°Girdle: MED-THKPavilion 29.4°Culet: NoneDepth 62.9%

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: £2,067 GBP|Low: £358 GBP|High: £3,896 GBP|Avg: £1,099 GBP|-46.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 31, 2026
Retailer 5£358 GBP
Retailer 9£430 GBP
Retailer 11£488 GBP
Retailer 10£601 GBP
Retailer 8£603 GBP
Retailer 14£626 GBP
Retailer 4£636 GBP
Retailer 12£652 GBP
Retailer 7£950 GBP
Retailer 13£1,008 GBP
Retailer 2£1,233 GBP
Retailer 3£1,463 GBP
Retailer 6£2,000 GBP
Brilliant Earth£2,067 GBP

35 data points across 14 retailers

13 retailers£430 GBP to £2,067 GBP

A
Cheapest Retailer
-
£430 GBP
HK$4,500 HKD
A
Retailer 2
-
£488 GBP
View
B+
Retailer 3
-
£601 GBP
$805 USD
View
A
Retailer 4
-
£603 GBP
€770 EUR
View
B
Retailer 5
-
£626 GBP
$839 USD
View
A
Retailer 6
-
£636 GBP
$852 USD
View
A
Retailer 7
-
£652 GBP
View
B+
Retailer 8
-
£950 GBP
$1,273 USD
View
B+
Retailer 9
-
£1,008 GBP
$1,351 USD
View
B+
Retailer 10
-
£1,233 GBP
SGD 2,232 SGD
View
B+
Retailer 11
-
£1,463 GBP
View
B
Retailer 12
-
£2,000 GBP
$2,680 USD
View
Most Expensive
B
Brilliant Earth
20143830A · Oct 30
£2,067 GBP
$2,770 USD
View
12 more retailers have this diamond
Prices start from £430 GBPSave up to £1,637 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
3.50ct Cushion
£430 GBP