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Cushion|Lab Grown|IGI

1.13ct F SI1 Cushion Lab Grown Diamond

GD • F/SI1 • IGI LG645409540

Shape and cutting style on the report: Cushion mixed cut

Certificate IGI LG645409540

Diamond specifications and retailer prices

From £258 GBP
As of November 6, 2026
Save £66 GBP (21%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £382 GBP at Rare Carat · As of August 9, 2026
View at Rare Carat

About this 1.13ct lab-grown cushion diamond

This 1.13ct lab-grown cushion sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG645409540 or 645409540. Listed at 3 retailers as of November 6, 2026, with a 26% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.13
Carat
F
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle44.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG645409540
Dimensions7.65 × 5.18 × 3.24 mm
L/W Ratio1.48
Culet sizeLong
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.65 mm5.18 mm1.13 ctF / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG645409540
Side View
Table 61.0%Crown 36.1°Girdle: STK-THKPavilion 44.9°Culet: LNGDepth 62.5%

Caratlytics Score

How it works →
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: Nov 6
Current: £382 GBP|Low: £213 GBP|High: £460 GBP|Avg: £303 GBP
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6£213 GBP
Retailer 3£217 GBP
Retailer 8£223 GBP
Retailer 5£258 GBP
Retailer 4£261 GBP
Retailer 2£324 GBP
Retailer 7£329 GBP
Retailer 10£365 GBP
Rare Carat£382 GBP
Retailer 9£460 GBP

5 data points across 10 retailers

3 retailers£258 GBP to £324 GBP

B+
Cheapest Retailer
-
£258 GBP
Final sale: no returns
B+
Retailer 2
-
£324 GBP
View
Most Expensive
Rare Carat
67779A_l_645409540 · Aug 9
£382 GBP
$511 USD
View
Price last confirmed 89 days ago
2 more retailers have this diamond
Prices start from £258 GBPSave up to £66 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+
1.13ct Cushion
£258 GBP