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Round|Lab Grown|IGI

3.50ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG818686987

Shape and cutting style on the report: Round brilliant

Certificate IGI LG818686987

Diamond specifications and retailer prices

From £3,402 GBP
$4,530 USD
As of October 25, 2026
13 retailers carry this diamond
Most expensive: £3,402 GBP at Brilliant Earth
View at Brilliant Earth

About this 3.5ct lab-grown round diamond

This 3.5ct lab-grown round 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 LG818686987 or 818686987. Listed at 13 retailers as of October 25, 2026. 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818686987
Dimensions9.77 × 9.86 × 5.92 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.77 mm9.86 mm3.50 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818686987
Side View
Table 62.0%Crown 33.4°Girdle: MediumPavilion 41.5°Culet: NoneDepth 60.2%

Caratlytics Score

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C
Average
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Price History

Last verified: Oct 25
Current: £3,402 GBP|Low: £382 GBP|High: £3,402 GBP|Avg: £1,023 GBP|+8.6%
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
Retailer 17
Retailer 18
Retailer 19
October 25, 2026
Retailer 14£398 GBP
Retailer 5£445 GBP
Retailer 18£445 GBP
Retailer 4£493 GBP
Retailer 7£493 GBP
Retailer 13£571 GBP
Retailer 17£665 GBP
Retailer 10£717 GBP
Retailer 12£745 GBP
Retailer 15£751 GBP
Retailer 3£764 GBP
Retailer 19£843 GBP
Retailer 2£1,274 GBP
Retailer 9£1,298 GBP
Retailer 6£1,498 GBP
Retailer 11£1,603 GBP
Retailer 8£1,687 GBP
Retailer 16£2,079 GBP
Brilliant Earth£3,402 GBP

16 data points across 19 retailers

13 retailers

Retailer 1
-
£398 GBP
$530 USD
Price last confirmed 19 days ago
Retailer 2
-
£445 GBP
$593 USD
View
Price last confirmed 16 days ago
Retailer 3
-
£493 GBP
$657 USD
View
Price last confirmed 25 days ago
Retailer 4
-
£493 GBP
$657 USD
View
Price last confirmed 19 days ago
Retailer 5
-
£665 GBP
View
Price last confirmed 23 days ago
Retailer 6
-
£764 GBP
$1,017 USD
View
Price last confirmed 15 days ago
Retailer 7
-
£1,274 GBP
$1,696 USD
View
Price last confirmed 14 days ago
Retailer 8
-
£1,298 GBP
$1,728 USD
View
Price last confirmed 22 days ago
Retailer 9
-
£1,498 GBP
$1,995 USD
View
Price last confirmed 22 days ago
Retailer 10
-
£1,603 GBP
$2,135 USD
View
Price last confirmed 14 days ago
Retailer 11
-
£1,687 GBP
$2,246 USD
View
Price last confirmed 16 days ago
Retailer 12
-
£2,079 GBP
View
Price last confirmed 22 days ago
Most Expensive
C
Brilliant Earth
21805039A · Oct 25
£3,402 GBP
$4,530 USD
View
12 more retailers have this diamond

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.

C
3.50ct Round
£3,402 GBP