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Cushion|Lab Grown|IGI

1.71ct E SI2 Cushion Lab Grown Diamond

GD • E/SI2 • IGI LG476167984

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

Certificate IGI LG476167984

Diamond specifications and retailer prices

From £191 GBP
$254 USD
As of October 28, 2026
Save £960 GBP (83%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,404 GBP at Brilliant Earth · As of October 2, 2026
View at Brilliant Earth

About this 1.71ct lab-grown cushion diamond

This 1.71ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a standard cut grade and certified by IGI LG476167984 or 476167984. Listed at 11 retailers as of October 28, 2026, with a 504% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.71
Carat
E
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle39°
OriginLab Grown
Grading LabIGI
CertificateIGI LG476167984
Dimensions6.96 × 6.75 × 4.59 mm
L/W Ratio1.03
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
6.96 mm6.75 mm1.71 ctE / SI2
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG476167984
Side View
Table 62.0%Crown 36.6°Girdle: MED-STKPavilion 39°Culet: NoneDepth 68.0%

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 28
Current: £1,404 GBP|Low: £191 GBP|High: £1,404 GBP|Avg: £614 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 10£191 GBP
Retailer 4£259 GBP
Retailer 5£300 GBP
Retailer 6£395 GBP
Retailer 2£506 GBP
Retailer 9£700 GBP
Retailer 8£758 GBP
Retailer 7£1,070 GBP
Retailer 3£1,151 GBP
Brilliant Earth£1,404 GBP

41 data points across 10 retailers

11 retailers£191 GBP to £1,151 GBP

A
Cheapest Retailer
-
£191 GBP
$254 USD
Final sale: no returns
B+
Retailer 2
-
£259 GBP
$345 USD
View
B+
Retailer 3
-
£300 GBP
$399 USD
View
B+
Retailer 4
-
£395 GBP
$526 USD
View
B+
Retailer 5
-
£506 GBP
View
B
Retailer 6
-
£685 GBP
CA$1,267 CAD
View
B
Retailer 7
-
£700 GBP
$933 USD
View
B
Retailer 8
-
£758 GBP
$1,010 USD
View
C
Retailer 9
-
£1,070 GBP
SGD 1,925 SGD
View
C
Retailer 10
-
£1,151 GBP
View
Most Expensive
Brilliant Earth
21630500Y · Oct 2
£1,404 GBP
$1,870 USD
View
Price last confirmed 27 days ago
10 more retailers have this diamond
Prices start from £191 GBPSave up to £960 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
1.71ct Cushion
£191 GBP