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Radiant|Lab Grown|IGI

3.50ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG698530204

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

Certificate IGI LG698530204

Diamond specifications and retailer prices

From £355 GBP
$475 USD
As of October 30, 2026
Save £2,265 GBP (86%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £2,620 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.5ct lab-grown radiant diamond

This 3.5ct lab-grown radiant 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 LG698530204 or 698530204. Listed at 18 retailers as of October 30, 2026, with prices from £355 to £2,620, a £2,265 spread on the same certified stone. Brilliant Earth lists it at £2,620. 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

3.50
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle49.2°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG698530204
Dimensions10.51 × 7.47 × 5.04 mm
L/W Ratio1.41
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.51 mm7.47 mm3.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG698530204
Side View
Table 70.0%Crown 49.2°Girdle: Slightly ThickPavilion 35.5°Culet: NoneDepth 67.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £2,620 GBP|Low: £397 GBP|High: £4,217 GBP|Avg: £1,242 GBP|-37.9%
Brilliant Earth
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
Retailer 15
Retailer 16
October 31, 2026
Retailer 7£397 GBP
Retailer 14£440 GBP
Retailer 15£478 GBP
Retailer 10£545 GBP
Retailer 4£605 GBP
Retailer 12£639 GBP
Retailer 9£730 GBP
Retailer 2£987 GBP
Retailer 16£999 GBP
Retailer 5£1,299 GBP
Retailer 3£1,393 GBP
Retailer 8£1,435 GBP
Retailer 6£1,546 GBP
Retailer 13£1,624 GBP
Retailer 11£2,485 GBP
Brilliant Earth£2,620 GBP

43 data points across 16 retailers

18 retailers£355 GBP to £2,620 GBP

A
Cheapest Retailer
-
£355 GBP
$475 USD
A
Retailer 2
-
£397 GBP
$532 USD
View
Final sale: no returns
A
Retailer 3
-
£397 GBP
$532 USD
View
A
Retailer 4
-
£440 GBP
$589 USD
View
A
Retailer 5
-
£478 GBP
HK$5,000 HKD
View
A
Retailer 6
-
£545 GBP
$730 USD
View
B+
Retailer 7
-
£605 GBP
$810 USD
View
Retailer 8
-
£639 GBP
€816 EUR
View
Price last confirmed 7 days ago
A
Retailer 9
-
£730 GBP
View
B+
Retailer 10
-
£987 GBP
$1,323 USD
View
B+
Retailer 11
-
£999 GBP
$1,339 USD
View
B
Retailer 12
-
£1,299 GBP
$1,740 USD
View
B+
Retailer 13
-
£1,393 GBP
SGD 2,523 SGD
View
B+
Retailer 14
-
£1,435 GBP
$1,923 USD
View
B
Retailer 15
-
£1,546 GBP
$2,072 USD
View
Retailer 16
-
£1,624 GBP
View
Price last confirmed 10 days ago
B
Retailer 17
-
£2,485 GBP
$3,330 USD
View
Most Expensive
B
Brilliant Earth
20386828A · Oct 30
£2,620 GBP
$3,510 USD
View
17 more retailers have this diamond
Prices start from £355 GBPSave up to £2,265 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
3.50ct Radiant
£355 GBP