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Round|Lab Grown|IGI

12.85ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG581343784

Shape and cutting style on the report: Round brilliant

Certificate IGI LG581343784

Diamond specifications and retailer prices

From $2,212 AUD
£1,223 GBP
As of October 30, 2026
Save $9,627 AUD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $11,839 AUD at Adiamor · As of October 31, 2026
View at Adiamor

About this 12.85ct lab-grown round diamond

This 12.85ct lab-grown round sits in the over five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG581343784 or 581343784. Listed at 11 retailers as of October 30, 2026, with prices from $2,212 to $11,839, a $9,627 spread on the same certified stone. Adiamor lists it at $11,839. 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

12.85
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG581343784
Dimensions15.16 × 15.26 × 9.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
15.16 mm15.26 mm12.85 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG581343784
Side View
Table 57.0%Crown 34°Girdle: MediumPavilion 40.8°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 30
Current: $11,839 AUD|Low: $2,212 AUD|High: $37,172 AUD|Avg: $9,522 AUD
Adiamor
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 31, 2026
Retailer 6$2,212 AUD
Retailer 8$2,367 AUD
Retailer 13$2,746 AUD
Retailer 9$2,990 AUD
Retailer 12$3,225 AUD
Retailer 11$3,605 AUD
Retailer 7$3,876 AUD
Retailer 10$4,371 AUD
Retailer 2$4,733 AUD
Retailer 3$5,146 AUD
Adiamor$11,839 AUD
Retailer 5$27,305 AUD
Retailer 4$37,172 AUD

4 data points across 13 retailers

11 retailers$2,212 AUD to $11,839 AUD

A
Cheapest Retailer
-
$2,212 AUD
£1,223 GBP
A
Retailer 2
-
$2,367 AUD
$1,663 USD
View
A
Retailer 3
-
$2,746 AUD
$1,929 USD
View
A
Retailer 4
-
$2,990 AUD
$2,100 USD
View
A
Retailer 5
-
$3,225 AUD
HK$17,700 HKD
View
A
Retailer 6
-
$3,605 AUD
$2,532 USD
View
A
Retailer 7
-
$3,876 AUD
£2,144 GBP
View
A
Retailer 8
-
$4,371 AUD
€2,924 EUR
View
A
Retailer 9
-
$4,733 AUD
$3,325 USD
View
B+
Retailer 10
-
$5,146 AUD
$3,615 USD
View
Most Expensive
B
Adiamor
D-82828535 · Oct 31
$11,839 AUD
$8,316 USD
View
10 more retailers have this diamond
Prices start from $2,212 AUDSave up to $9,627 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
12.85ct Round
$2,212 AUD