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Cushion|Lab Grown|IGI

1.71ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG766660227

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG766660227

Diamond specifications and retailer prices

From £352 GBP
€447 EUR
As of October 29, 2026
Save £1,277 GBP (78%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,630 GBP at Brilliant Earth · As of October 29, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG766660227 or 766660227. Listed at 9 retailers as of October 29, 2026, with prices from £352 to £1,630, a £1,277 spread on the same certified stone. Brilliant Earth lists it at £1,630. 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

1.71
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle32.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG766660227
Dimensions7.63 × 6.67 × 4.02 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.63 mm6.67 mm1.71 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG766660227
Side View
Table 59.0%Crown 33.7°Girdle: MED-THKPavilion 32.3°Culet: NoneDepth 60.3%

Caratlytics Score

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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 29
Current: £1,630 GBP|Low: £345 GBP|High: £1,675 GBP|Avg: £669 GBP|-2.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 29, 2026
Retailer 3£352 GBP
Retailer 6£363 GBP
Retailer 2£401 GBP
Retailer 7£409 GBP
Retailer 8£428 GBP
Retailer 9£726 GBP
Retailer 5£815 GBP
Retailer 4£860 GBP
Brilliant Earth£1,630 GBP

41 data points across 9 retailers

9 retailers£352 GBP to £1,630 GBP

A
Cheapest Retailer
-
£352 GBP
€447 EUR
B+
Retailer 2
-
£363 GBP
$484 USD
View
A
Retailer 3
-
£401 GBP
View
A
Retailer 4
-
£409 GBP
$545 USD
View
A
Retailer 5
-
£428 GBP
$570 USD
View
B+
Retailer 6
-
£726 GBP
$967 USD
View
Retailer 7
-
£815 GBP
$1,085 USD
View
Price last confirmed 11 days ago
B
Retailer 8
-
£860 GBP
View
Most Expensive
B
Brilliant Earth
17710949A · Oct 29
£1,630 GBP
$2,170 USD
View
8 more retailers have this diamond
Prices start from £352 GBPSave up to £1,277 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
£352 GBP