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Round|Lab Grown|IGI

3.56ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG689536418

Shape and cutting style on the report: Round brilliant

Certificate IGI LG689536418

Diamond specifications and retailer prices

From £283 GBP
$379 USD
As of October 29, 2026
Save £1,143 GBP (80%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,425 GBP at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 3.56ct lab-grown round diamond

This 3.56ct 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 LG689536418 or 689536418. Listed at 14 retailers as of October 28, 2026, with prices from £283 to £1,425, a £1,143 spread on the same certified stone. Rare Carat lists it at £1,425. 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

3.56
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG689536418
Dimensions9.85 × 9.91 × 5.99 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
9.85 mm9.91 mm3.56 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG689536418
Side View
Table 57.0%Crown 34.4°Girdle: THN-MEDPavilion 40.8°Culet: NoneDepth 60.7%

Caratlytics Score

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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: Oct 29
Current: £1,425 GBP|Low: £283 GBP|High: £3,821 GBP|Avg: £1,163 GBP|-27.6%
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
Retailer 15
Retailer 16
October 30, 2026
Retailer 10£283 GBP
Retailer 6£317 GBP
Retailer 5£351 GBP
Retailer 15£392 GBP
Retailer 11£463 GBP
Retailer 2£470 GBP
Retailer 3£558 GBP
Retailer 12£560 GBP
Retailer 14£598 GBP
Retailer 9£633 GBP
Retailer 16£823 GBP
Retailer 4£1,128 GBP
Retailer 13£1,378 GBP
Rare Carat£1,425 GBP
Retailer 7£3,640 GBP
Retailer 8£3,821 GBP

4 data points across 16 retailers

14 retailers£283 GBP to £1,425 GBP

A
Cheapest Retailer
-
£283 GBP
$379 USD
A
Retailer 2
-
£317 GBP
$425 USD
View
A
Retailer 3
-
£351 GBP
$470 USD
View
A
Retailer 4
-
£392 GBP
HK$4,100 HKD
View
A
Retailer 5
-
£463 GBP
$620 USD
View
A
Retailer 6
-
£470 GBP
View
B+
Retailer 7
-
£558 GBP
$748 USD
View
A
Retailer 8
-
£560 GBP
€715 EUR
View
A
Retailer 9
-
£598 GBP
$801 USD
View
A
Retailer 10
-
£633 GBP
View
B+
Retailer 11
-
£823 GBP
$1,103 USD
View
B+
Retailer 12
-
£1,128 GBP
$1,511 USD
View
B
Retailer 13
-
£1,378 GBP
View
Most Expensive
B
Rare Carat
KI4185364KF689 · Oct 28
£1,425 GBP
$1,910 USD
View
13 more retailers have this diamond
Prices start from £283 GBPSave up to £1,143 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
3.56ct Round
£283 GBP