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Cushion|Lab Grown|IGI

4.00ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG817688700

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

Certificate IGI LG817688700

Diamond specifications and retailer prices

From £2,679 GBP
$3,590 USD
As of October 31, 2026
Save £4,493 GBP (63%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £7,172 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 4ct lab-grown cushion diamond

This 4ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG817688700 or 817688700. Listed at 7 retailers as of October 29, 2026, with prices from £2,679 to £7,172, a £4,493 spread on the same certified stone. Brilliant Earth lists it at £7,172. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.00
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.8°
Pavilion angle36.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817688700
Dimensions8.99 × 8.89 × 5.96 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
8.99 mm8.89 mm4.00 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817688700
Side View
Table 61.0%Crown 32.8°Girdle: MED-THKPavilion 36.8°CuletDepth 67.0%

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: £7,172 GBP|Low: £2,239 GBP|High: £7,792 GBP|Avg: £4,878 GBP|-8.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 2£2,679 GBP
Retailer 3£2,930 GBP
Retailer 5£3,245 GBP
Retailer 6£4,540 GBP
Retailer 7£4,543 GBP
Retailer 4£5,601 GBP
Brilliant Earth£7,172 GBP

32 data points across 7 retailers

7 retailers£2,679 GBP to £7,172 GBP

A
Cheapest Retailer
-
£2,679 GBP
$3,590 USD
A
Retailer 2
-
£2,930 GBP
$3,926 USD
View
A
Retailer 3
-
£3,245 GBP
$4,348 USD
View
A
Retailer 4
-
£4,540 GBP
€5,793 EUR
View
Retailer 5
-
£4,543 GBP
A$9,365 AUD
View
Price last confirmed 9 days ago
A
Retailer 6
-
£5,601 GBP
View
Most Expensive
B+
Brilliant Earth
20983230A · Oct 29
£7,172 GBP
$9,610 USD
View
6 more retailers have this diamond
Prices start from £2,679 GBPSave up to £4,493 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
4.00ct Cushion
£2,679 GBP