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Cushion|Lab Grown|IGI

3.05ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG809618099

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG809618099

Diamond specifications and retailer prices

From £300 GBP
As of November 4, 2026
Save £1,145 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,446 GBP at Rare Carat · As of November 1, 2026
View at Rare Carat

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 LG809618099 or 809618099. Listed at 11 retailers as of November 1, 2026, with prices from £300 to £1,446, a £1,145 spread on the same certified stone. Rare Carat lists it at £1,446. 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 angle31.5°
Pavilion angle34.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG809618099
Dimensions9.73 × 7.12 × 4.78 mm
L/W Ratio1.37
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.73 mm7.12 mm3.05 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG809618099
Side View
Table 58.0%Crown 31.5°Girdle: STK-THKPavilion 34.7°Culet: NoneDepth 67.1%

Caratlytics Score

How it works →
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 4
Current: £1,446 GBP|Low: £300 GBP|High: £1,468 GBP|Avg: £798 GBP|-1.5%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 3£300 GBP
Retailer 6£333 GBP
Retailer 5£504 GBP
Retailer 10£534 GBP
Retailer 2£594 GBP
Retailer 8£625 GBP
Retailer 7£763 GBP
Retailer 9£1,100 GBP
Retailer 11£1,272 GBP
Retailer 4£1,298 GBP
Rare Carat£1,446 GBP

43 data points across 11 retailers

11 retailers£300 GBP to £1,446 GBP

A
Cheapest Retailer
-
£300 GBP
Final sale: no returns
Retailer 2
-
£333 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£504 GBP
View
B+
Retailer 4
-
£534 GBP
View
A
Retailer 5
-
£594 GBP
View
A
Retailer 6
-
£625 GBP
View
A
Retailer 7
-
£763 GBP
View
B+
Retailer 8
-
£1,100 GBP
View
B
Retailer 9
-
£1,272 GBP
View
B+
Retailer 10
-
£1,298 GBP
View
Most Expensive
B+
Rare Carat
K08-51A_l_809618099 · Nov 1
£1,446 GBP
$1,935 USD
View
10 more retailers have this diamond
Prices start from £300 GBPSave up to £1,145 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
£300 GBP