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Round|Lab Grown|IGI

3.09ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG700584426

Shape and cutting style on the report: Round brilliant

Certificate IGI LG700584426

Diamond specifications and retailer prices

From £271 GBP
As of November 5, 2026
Save £1,219 GBP (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,490 GBP at Rare Carat · As of November 4, 2026
View at Rare Carat

About this 3.09ct lab-grown round diamond

This 3.09ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG700584426 or 700584426. Listed at 15 retailers as of November 4, 2026, with prices from £271 to £1,490, a £1,219 spread on the same certified stone. Rare Carat lists it at £1,490. 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

3.09
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG700584426
Dimensions9.38 × 9.42 × 5.76 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.38 mm9.42 mm3.09 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG700584426
Side View
Table 57.0%Crown 34.5°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.3%

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 5
Current: £1,490 GBP|Low: £271 GBP|High: £3,938 GBP|Avg: £1,064 GBP|-27.5%
Rare Carat
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
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Retailer 17
November 6, 2026
Retailer 13£271 GBP
Retailer 7£315 GBP
Retailer 6£337 GBP
Retailer 17£371 GBP
Retailer 10£447 GBP
Retailer 14£450 GBP
Retailer 15£536 GBP
Retailer 4£538 GBP
Retailer 16£571 GBP
Retailer 2£599 GBP
Retailer 3£830 GBP
Retailer 12£987 GBP
Retailer 5£1,081 GBP
Retailer 11£1,314 GBP
Rare Carat£1,490 GBP
Retailer 8£3,387 GBP
Retailer 9£3,938 GBP

11 data points across 17 retailers

15 retailers£271 GBP to £1,490 GBP

A
Cheapest Retailer
-
£271 GBP
A
Retailer 2
-
£315 GBP
View
A
Retailer 3
-
£337 GBP
View
A
Retailer 4
-
£371 GBP
View
A
Retailer 5
-
£447 GBP
View
A
Retailer 6
-
£450 GBP
View
Retailer 7
-
£536 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£538 GBP
View
A
Retailer 9
-
£571 GBP
View
A
Retailer 10
-
£599 GBP
View
B+
Retailer 11
-
£830 GBP
View
B+
Retailer 12
-
£987 GBP
View
B
Retailer 13
-
£1,081 GBP
View
B
Retailer 14
-
£1,314 GBP
View
Most Expensive
B
Rare Carat
KI4265844KF700 · Nov 4
£1,490 GBP
$2,005 USD
View
14 more retailers have this diamond
Prices start from £271 GBPSave up to £1,219 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
3.09ct Round
£271 GBP