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Cushion|Lab Grown|IGI

3.05ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG529243211

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG529243211

Diamond specifications and retailer prices

From £470 GBP
$630 USD
As of October 31, 2026
Save £2,941 GBP (86%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £3,411 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.05ct lab-grown cushion diamond

This 3.05ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG529243211 or 529243211. Listed at 8 retailers as of October 29, 2026, with prices from £470 to £3,411, a £2,941 spread on the same certified stone. Brilliant Earth lists it at £3,411. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.05
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG529243211
Dimensions8.60 × 7.86 × 5.22 mm
L/W Ratio1.09
Girdle conditionFaceted
Culet sizePointed
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
8.60 mm7.86 mm3.05 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG529243211
Side View
Table 64.5%Crown 33°Girdle: THK-VTKPavilion 34.3°Culet: NoneDepth 66.4%

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 31
Current: £3,411 GBP|Low: £323 GBP|High: £3,515 GBP|Avg: £1,322 GBP|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 7£470 GBP
Retailer 4£601 GBP
Retailer 6£727 GBP
Retailer 5£802 GBP
Retailer 2£812 GBP
Retailer 3£2,272 GBP
Brilliant Earth£3,411 GBP

40 data points across 7 retailers

8 retailers£470 GBP to £3,411 GBP

A
Cheapest Retailer
-
£470 GBP
$630 USD
Final sale: no returns
A
Retailer 2
-
£601 GBP
$805 USD
View
A
Retailer 3
-
£727 GBP
$974 USD
View
B+
Retailer 4
-
£802 GBP
$1,075 USD
View
A
Retailer 5
-
£812 GBP
View
B
Retailer 6
-
£1,681 GBP
HK$17,600 HKD
View
B
Retailer 7
-
£2,272 GBP
View
Most Expensive
B
Brilliant Earth
17971335A · Oct 29
£3,411 GBP
$4,570 USD
View
7 more retailers have this diamond
Prices start from £470 GBPSave up to £2,941 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
3.05ct Cushion
£470 GBP