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Radiant|Lab Grown|IGI

3.03ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG685590258

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG685590258

Diamond specifications and retailer prices

From £241 GBP
As of November 6, 2026
Save £1,280 GBP (84%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,520 GBP at Rare Carat · As of November 1, 2026
View at Rare Carat

About this 3.03ct lab-grown radiant diamond

This 3.03ct lab-grown radiant sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG685590258 or 685590258. Listed at 16 retailers as of November 1, 2026, with prices from £241 to £1,520, a £1,280 spread on the same certified stone. Rare Carat lists it at £1,520. 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

3.03
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.5°
Pavilion angle35.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG685590258
Dimensions10.36 × 7.04 × 4.81 mm
L/W Ratio1.47
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.36 mm7.04 mm3.03 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG685590258
Side View
Table 64.0%Crown 45.5°Girdle: MediumPavilion 35.7°Culet: NoneDepth 68.3%

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 6
Current: £1,520 GBP|Low: £241 GBP|High: £3,788 GBP|Avg: £1,002 GBP|-30.4%
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 7, 2026
Retailer 7£241 GBP
Retailer 14£279 GBP
Retailer 4£299 GBP
Retailer 6£335 GBP
Retailer 11£363 GBP
Retailer 2£415 GBP
Retailer 17£484 GBP
Retailer 10£486 GBP
Retailer 12£527 GBP
Retailer 16£536 GBP
Retailer 3£728 GBP
Retailer 15£876 GBP
Retailer 5£960 GBP
Retailer 13£1,193 GBP
Rare Carat£1,520 GBP
Retailer 8£2,855 GBP
Retailer 9£3,788 GBP

12 data points across 17 retailers

16 retailers£241 GBP to £1,520 GBP

A
Cheapest Retailer
-
£241 GBP
A
Retailer 2
-
£279 GBP
View
A
Retailer 3
-
£299 GBP
View
A
Retailer 4
-
£335 GBP
View
A
Retailer 5
-
£363 GBP
View
A
Retailer 6
-
£415 GBP
View
B+
Retailer 7
-
£484 GBP
View
A
Retailer 8
-
£486 GBP
View
A
Retailer 9
-
£527 GBP
View
A
Retailer 10
-
£536 GBP
View
A
Retailer 11
-
£728 GBP
View
B+
Retailer 12
-
£876 GBP
View
B+
Retailer 13
-
£960 GBP
View
B+
Retailer 14
-
£1,193 GBP
View
B+
Retailer 15
-
£1,219 GBP
View
Most Expensive
B
Rare Carat
KI2585902KF685 · Nov 1
£1,520 GBP
$2,035 USD
View
15 more retailers have this diamond
Prices start from £241 GBPSave up to £1,280 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
3.03ct Radiant
£241 GBP