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Round|Lab Grown|IGI

3.70ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG645453866

Shape and cutting style on the report: Round brilliant

Certificate IGI LG645453866

Diamond specifications and retailer prices

From £969 GBP
CA$1,803 CAD
As of October 30, 2026
Save £312 GBP (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,281 GBP at The Diamond Guys · As of November 1, 2026
View at The Diamond Guys

About this 3.7ct lab-grown round diamond

This 3.7ct 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 LG645453866 or 645453866. Listed at 2 retailers as of October 30, 2026, with prices from £969 to £1,281, a £312 spread on the same certified stone. The Diamond Guys lists it at £1,281. 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

3.70
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG645453866
Dimensions10.04 × 9.98 × 6.04 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.04 mm9.98 mm3.70 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG645453866
Side View
Table 58.0%Crown 34.1°Girdle: MediumPavilion 40.7°Culet: NoneDepth 60.4%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 30
Current: £813 GBP|Low: £193 GBP|High: £3,762 GBP|Avg: £1,123 GBP|-6.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
The Diamond Guys
August 3, 2026
Retailer 4£528 GBP
Retailer 5£573 GBP
Retailer 10£646 GBP
Retailer 12£651 GBP
Retailer 6£774 GBP
Retailer 9£784 GBP
Retailer 1£813 GBP
Retailer 7£969 GBP
Retailer 2£1,243 GBP
The Diamond Guys£1,281 GBP
Retailer 3£1,664 GBP
Retailer 11£2,000 GBP
Retailer 8£3,762 GBP

58 data points across 13 retailers

2 retailers£969 GBP to £1,281 GBP

B+
Cheapest Retailer
-
£969 GBP
CA$1,803 CAD
Most Expensive
B
The Diamond Guys
1954434371 · Nov 1
£1,281 GBP
$1,717 USD
View
1 more retailer has this diamond
Prices start from £969 GBPSave up to £312 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+
3.70ct Round
£969 GBP