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Cushion|Lab Grown|IGI

1.71ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG551273812

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG551273812

Diamond specifications and retailer prices

From £620 GBP
$832 USD
As of October 27, 2026
Save £766 GBP (55%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,386 GBP at Do Amore Diamonds · As of October 27, 2026
View at Do Amore Diamonds

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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG551273812 or 551273812. Listed at 5 retailers as of October 27, 2026, with prices from £620 to £1,386, a £766 spread on the same certified stone. Do Amore Diamonds lists it at £1,386. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG551273812
Dimensions7.82 × 6.52 × 4.46 mm
L/W Ratio1.20
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.82 mm6.52 mm1.71 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG551273812
Side View
Table 59.0%Crown 36.1°Girdle: MED-STKPavilion 38.5°Culet: NoneDepth 68.4%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: £1,386 GBP|Low: £116 GBP|High: £1,505 GBP|Avg: £706 GBP|-7.9%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 18, 2026
Retailer 6£171 GBP
Retailer 3£312 GBP
Retailer 7£583 GBP
Retailer 4£620 GBP
Retailer 2£796 GBP
Retailer 5£902 GBP
Do Amore Diamonds£1,386 GBP

15 data points across 7 retailers

5 retailers£620 GBP to £1,386 GBP

Retailer 1
-
£312 GBP
$419 USD
Price last confirmed 8 days ago
B+
Retailer 2
-
£620 GBP
$832 USD
View
Retailer 3
-
£796 GBP
View
Price last confirmed 12 days ago
B
Retailer 4
-
£902 GBP
$1,210 USD
View
Most Expensive
B
Do Amore Diamonds
27-7603D228F · Oct 27
£1,386 GBP
$1,860 USD
View
4 more retailers have this diamond
Prices start from £620 GBPSave up to £766 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.

B+
1.71ct Cushion
£620 GBP