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Round|Lab Grown|IGI

3.05ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG623459806

Shape and cutting style on the report: Round brilliant

Certificate IGI LG623459806

Diamond specifications and retailer prices

From £918 GBP
As of November 5, 2026
Save £297 GBP (24%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £1,215 GBP at The Diamond Guys · As of November 6, 2026
View at The Diamond Guys

About this 3.05ct lab-grown round diamond

This 3.05ct lab-grown round 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 LG623459806 or 623459806. Listed at 3 retailers as of November 5, 2026, with prices from £918 to £1,215, a £297 spread on the same certified stone. The Diamond Guys lists it at £1,215. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG623459806
Dimensions9.19 × 9.16 × 5.80 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
9.19 mm9.16 mm3.05 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG623459806
Side View
Table 57.0%Crown 36.4°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 63.2%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: £258 GBP|Low: £184 GBP|High: £3,091 GBP|Avg: £994 GBP|+35.5%
Retailer 1
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Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
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Retailer 10
Retailer 11
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Retailer 15
The Diamond Guys
September 18, 2026
Retailer 1£258 GBP
Retailer 13£295 GBP
Retailer 8£299 GBP
Retailer 11£415 GBP
Retailer 12£465 GBP
Retailer 9£506 GBP
Retailer 10£516 GBP
Retailer 14£693 GBP
Retailer 2£695 GBP
Retailer 3£776 GBP
Retailer 15£796 GBP
Retailer 5£918 GBP
The Diamond Guys£1,215 GBP
Retailer 4£1,384 GBP
Retailer 6£1,857 GBP
Retailer 7£1,939 GBP

65 data points across 16 retailers

3 retailers£918 GBP to £1,215 GBP

Retailer 1
-
£295 GBP
Price last confirmed 51 days ago
B+
Retailer 2
-
£918 GBP
View
Most Expensive
B
The Diamond Guys
1954434427 · Nov 6
£1,215 GBP
$1,635 USD
View
2 more retailers have this diamond
Prices start from £918 GBPSave up to £297 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+
3.05ct Round
£918 GBP