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Cushion|Lab Grown|IGI

3.05ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG812619683

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG812619683

Diamond specifications and retailer prices

From £296 GBP
As of November 6, 2026
Save £1,617 GBP (85%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,913 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 3.05ct lab-grown cushion diamond

This 3.05ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG812619683 or 812619683. Listed at 15 retailers as of November 6, 2026, with prices from £296 to £1,913, a £1,617 spread on the same certified stone. Brilliant Earth lists it at £1,913. 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

3.05
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG812619683
Dimensions10.28 × 7.42 × 4.67 mm
L/W Ratio1.39
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.28 mm7.42 mm3.05 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG812619683
Side View
Table 61.0%Crown 34.1°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,913 GBP|Low: £296 GBP|High: £1,913 GBP|Avg: £790 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 12£296 GBP
Retailer 6£363 GBP
Retailer 8£400 GBP
Retailer 11£441 GBP
Retailer 2£507 GBP
Retailer 13£527 GBP
Retailer 7£569 GBP
Retailer 9£586 GBP
Retailer 14£773 GBP
Retailer 4£820 GBP
Retailer 15£825 GBP
Retailer 3£1,051 GBP
Retailer 10£1,281 GBP
Retailer 5£1,457 GBP
Brilliant Earth£1,913 GBP

30 data points across 15 retailers

15 retailers£296 GBP to £1,913 GBP

A
Cheapest Retailer
-
£296 GBP
Final sale: no returns
A
Retailer 2
-
£363 GBP
View
A
Retailer 3
-
£400 GBP
View
A
Retailer 4
-
£441 GBP
View
A
Retailer 5
-
£507 GBP
View
B+
Retailer 6
-
£527 GBP
View
Retailer 7
-
£569 GBP
View
Price last confirmed 11 days ago
A
Retailer 8
-
£586 GBP
View
A
Retailer 9
-
£773 GBP
View
A
Retailer 10
-
£820 GBP
View
B+
Retailer 11
-
£825 GBP
View
B+
Retailer 12
-
£1,051 GBP
View
B+
Retailer 13
-
£1,281 GBP
View
Retailer 14
-
£1,457 GBP
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
20319639A · Nov 6
£1,913 GBP
$2,560 USD
View
14 more retailers have this diamond
Prices start from £296 GBPSave up to £1,617 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
3.05ct Cushion
£296 GBP