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Cushion|Lab Grown|IGI

1.61ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG551273866

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG551273866

Diamond specifications and retailer prices

From £300 GBP
$402 USD
As of October 25, 2026
4 retailers carry this diamond
Most expensive: £1,312 GBP at Brilliant Earth · As of October 26, 2026
View at Brilliant Earth

About this 1.61ct lab-grown cushion diamond

This 1.61ct 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 LG551273866 or 551273866. Listed at 4 retailers as of October 25, 2026. 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

1.61
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.4°
Pavilion angle39.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG551273866
Dimensions7.65 × 6.30 × 4.28 mm
L/W Ratio1.21
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
7.65 mm6.30 mm1.61 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG551273866
Side View
Table 62.0%Crown 35.4°Girdle: MED-THKPavilion 39.3°Culet: NoneDepth 67.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 25
Current: £1,312 GBP|Low: £110 GBP|High: £1,394 GBP|Avg: £768 GBP|-3.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 26, 2026
Retailer 6£162 GBP
Retailer 4£300 GBP
Retailer 5£598 GBP
Retailer 2£878 GBP
Brilliant Earth£1,312 GBP
Retailer 3£1,319 GBP

17 data points across 6 retailers

4 retailers£300 GBP to £1,312 GBP

Retailer 1
-
£300 GBP
$402 USD
Price last confirmed 8 days ago
Retailer 2
-
£598 GBP
$802 USD
View
Price last confirmed 7 days ago
Retailer 3
-
£878 GBP
View
Price last confirmed 7 days ago
Most Expensive
Brilliant Earth
6534875Y · Oct 26
£1,312 GBP
$1,760 USD
View
Price last confirmed 7 days ago
3 more retailers have this diamond

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
1.61ct Cushion
£300 GBP