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Round|Lab Grown|IGI

3.50ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG821689512

Shape and cutting style on the report: Round brilliant

Certificate IGI LG821689512

Diamond specifications and retailer prices

From $680 AUD
$478 USD
As of October 26, 2026
Save $2,435 AUD (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $6,640 AUD at Brilliant Earth · As of October 1, 2026
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 LG821689512 or 821689512. Listed at 18 retailers as of October 26, 2026, with a 358% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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 angle31.7°
Pavilion angle41.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG821689512
Dimensions9.80 × 9.85 × 5.93 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
9.80 mm9.85 mm3.50 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG821689512
Side View
Table 61.0%Crown 31.7°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 60.4%

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: Oct 26
Current: $1,396 AUD|Low: $680 AUD|High: $3,137 AUD|Avg: $1,775 AUD|+4.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 9$680 AUD
Retailer 5$1,045 AUD
Retailer 6$1,128 AUD
Retailer 10$1,317 AUD
Retailer 1$1,396 AUD
Retailer 4$1,444 AUD
Retailer 2$1,571 AUD
Retailer 8$2,268 AUD
Retailer 7$2,751 AUD
Retailer 3$3,115 AUD

41 data points across 10 retailers

18 retailers$680 AUD to $3,115 AUD

A
Retailer 1
-
$680 AUD
$478 USD
Price last confirmed 37 days ago
A
Retailer 2
-
$680 AUD
$478 USD
View
A
Retailer 3
-
$762 AUD
$536 USD
View
A
Retailer 4
-
$833 AUD
$586 USD
View
Price last confirmed 37 days ago
A
Retailer 5
-
$843 AUD
$593 USD
View
A
Retailer 6
-
$843 AUD
$593 USD
View
Price last confirmed 13 days ago
A
Retailer 7
-
$1,045 AUD
$735 USD
View
A
Retailer 8
-
$1,128 AUD
£625 GBP
View
B+
Retailer 9
-
$1,317 AUD
$926 USD
View
A
Retailer 10
-
$1,396 AUD
£773 GBP
View
A
Retailer 11
-
$1,444 AUD
€967 EUR
View
A
Retailer 12
-
$1,571 AUD
$1,105 USD
View
B
Retailer 13
-
$2,268 AUD
$1,595 USD
View
B
Retailer 14
-
$2,712 AUD
$1,907 USD
View
B
Retailer 15
-
$2,712 AUD
$1,907 USD
View
Price last confirmed 38 days ago
B
Retailer 16
-
$2,751 AUD
$1,935 USD
View
B
Retailer 17
-
$3,115 AUD
£1,725 GBP
View
Most Expensive
B
Brilliant Earth
21314933A · Oct 1
$6,640 AUD
$4,670 USD
View
Price last confirmed 27 days ago
17 more retailers have this diamond
Prices start from $680 AUDSave up to $2,435 AUD

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 Round
$680 AUD