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Round|Lab Grown|IGI

3.21ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG654411372

Shape and cutting style on the report: Round brilliant

Certificate IGI LG654411372

Diamond specifications and retailer prices

From £299 GBP
$401 USD
As of October 29, 2026
Save £1,335 GBP (82%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,634 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.21ct lab-grown round diamond

This 3.21ct lab-grown round sits in the three to five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG654411372 or 654411372. Listed at 21 retailers as of October 29, 2026, with prices from £299 to £1,634, a £1,335 spread on the same certified stone. Brilliant Earth lists it at £1,634. 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

3.21
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG654411372
Dimensions9.44 × 9.49 × 5.81 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
9.44 mm9.49 mm3.21 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG654411372
Side View
Table 58.0%Crown 35.2°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.4%

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: £1,634 GBP|Low: £297 GBP|High: £1,634 GBP|Avg: £817 GBP
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
October 31, 2026
Retailer 8£299 GBP
Retailer 15£336 GBP
Retailer 13£362 GBP
Retailer 4£372 GBP
Retailer 18£372 GBP
Retailer 14£481 GBP
Retailer 5£588 GBP
Retailer 3£603 GBP
Retailer 2£608 GBP
Retailer 12£620 GBP
Retailer 17£814 GBP
Retailer 7£937 GBP
Retailer 9£1,194 GBP
Retailer 10£1,221 GBP
Retailer 16£1,366 GBP
Retailer 6£1,370 GBP
Retailer 11£1,459 GBP
Brilliant Earth£1,634 GBP

44 data points across 18 retailers

21 retailers£299 GBP to £1,634 GBP

Retailer 1
-
£297 GBP
$398 USD
Price last confirmed 39 days ago
A
Retailer 2
-
£299 GBP
$401 USD
View
A
Retailer 3
-
£336 GBP
$450 USD
View
A
Retailer 4
-
£362 GBP
$485 USD
View
Final sale: no returns
Retailer 5
-
£363 GBP
$487 USD
View
Price last confirmed 39 days ago
A
Retailer 6
-
£372 GBP
$498 USD
View
A
Retailer 7
-
£372 GBP
$498 USD
View
A
Retailer 8
-
£481 GBP
$645 USD
View
B+
Retailer 9
-
£588 GBP
$788 USD
View
A
Retailer 10
-
£603 GBP
$808 USD
View
A
Retailer 11
-
£608 GBP
View
A
Retailer 12
-
£620 GBP
€791 EUR
View
B+
Retailer 13
-
£814 GBP
$1,091 USD
View
B
Retailer 14
-
£937 GBP
$1,255 USD
View
Retailer 15
-
£1,183 GBP
$1,585 USD
View
Price last confirmed 40 days ago
B
Retailer 16
-
£1,194 GBP
$1,600 USD
View
B
Retailer 17
-
£1,221 GBP
$1,636 USD
View
Retailer 18
-
£1,366 GBP
$1,830 USD
View
Price last confirmed 13 days ago
B
Retailer 19
-
£1,370 GBP
$1,836 USD
View
B
Retailer 20
-
£1,459 GBP
View
Most Expensive
B
Brilliant Earth
14276809A · Oct 29
£1,634 GBP
$2,190 USD
View
20 more retailers have this diamond
Prices start from £299 GBPSave up to £1,335 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
3.21ct Round
£299 GBP