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Cushion|Lab Grown|IGI

1.23ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG801682433

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG801682433

Diamond specifications and retailer prices

From £194 GBP
As of November 6, 2026
Save £359 GBP (65%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £783 GBP at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.23ct lab-grown cushion diamond

This 1.23ct 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 LG801682433 or 801682433. Listed at 15 retailers as of November 6, 2026, with a 185% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.23
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG801682433
Dimensions6.71 × 5.53 × 4.06 mm
L/W Ratio1.21
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
6.71 mm5.53 mm1.23 ctF / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG801682433
Side View
Table 64.0%Crown 38°Girdle: STK-VTKPavilion 36.2°Culet: NoneDepth 73.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £245 GBP|Low: £129 GBP|High: £836 GBP|Avg: £423 GBP|-7.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Reve Diamonds
November 6, 2026
Retailer 3£129 GBP
Retailer 4£194 GBP
Retailer 1£245 GBP
Retailer 10£248 GBP
Retailer 9£278 GBP
Retailer 6£319 GBP
Retailer 5£347 GBP
Retailer 2£387 GBP
Retailer 8£463 GBP
Retailer 12£501 GBP
Retailer 7£553 GBP
Retailer 11£669 GBP
Reve Diamonds£783 GBP

37 data points across 13 retailers

15 retailers£194 GBP to £553 GBP

B+
Cheapest Retailer
-
£194 GBP
A
Retailer 2
-
£245 GBP
View
Retailer 3
-
£248 GBP
View
Price last confirmed 11 days ago
Retailer 4
-
£278 GBP
View
Price last confirmed 10 days ago
Retailer 5
-
£287 GBP
View
Price last confirmed 26 days ago
B+
Retailer 6
-
£319 GBP
View
B+
Retailer 7
-
£347 GBP
View
Retailer 8
-
£357 GBP
View
Price last confirmed 12 days ago
Retailer 9
-
£387 GBP
View
Price last confirmed 12 days ago
Retailer 10
-
£459 GBP
View
Price last confirmed 44 days ago
B+
Retailer 11
-
£463 GBP
View
Retailer 12
-
£501 GBP
View
Price last confirmed 11 days ago
B
Retailer 13
-
£553 GBP
View
Retailer 14
-
£669 GBP
View
Price last confirmed 12 days ago
Most Expensive
Reve Diamonds
E41CDD5BE · Oct 25
£783 GBP
$1,048 USD
View
Price last confirmed 12 days ago
14 more retailers have this diamond
Prices start from £194 GBPSave up to £359 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
1.23ct Cushion
£194 GBP