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Cushion|Lab Grown|IGI

1.00ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG836640729

Certificate IGI LG836640729

Diamond specifications and retailer prices

From £319 GBP
€408 EUR
As of November 2, 2026
Save £329 GBP (51%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £648 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1ct lab-grown cushion diamond

This 1ct lab-grown cushion sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG836640729 or 836640729. Listed at 2 retailers as of November 2, 2026, with prices from £319 to £648, a £329 spread on the same certified stone. Brilliant Earth lists it at £648. 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

1.00
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG836640729
Dimensions5.76 × 5.69 × 3.82 mm
L/W Ratio1.01
Top View
5.76 mm5.69 mm1.00 ctF / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG836640729
Side View
Table 62.0%CrownGirdlePavilionCuletDepth 67.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: £648 GBP|Low: £319 GBP|High: £648 GBP|Avg: £539 GBP
Brilliant Earth
Retailer 2
November 2, 2026
Retailer 2£319 GBP
Brilliant Earth£648 GBP

2 data points across 2 retailers

2 retailers£319 GBP to £648 GBP

B+
Cheapest Retailer
-
£319 GBP
€408 EUR
Most Expensive
C
Brilliant Earth
22297006A · Nov 2
£648 GBP
$870 USD
View
1 more retailer has this diamond
Prices start from £319 GBPSave up to £329 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+
1.00ct Cushion
£319 GBP