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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 $1,554 USD
£1,223 GBP
As of October 30, 2026
Save $6,762 USD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $8,316 USD 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 $1,554 to $8,316, a $6,762 spread on the same certified stone. Adiamor lists it at $8,316. 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
Color
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: $8,316 USD|Low: $1,554 USD|High: $26,111 USD|Avg: $6,689 USD
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$1,554 USD
Retailer 8$1,663 USD
Retailer 13$1,929 USD
Retailer 9$2,100 USD
Retailer 12$2,266 USD
Retailer 11$2,532 USD
Retailer 7$2,723 USD
Retailer 10$3,070 USD
Retailer 2$3,325 USD
Retailer 3$3,615 USD
Adiamor$8,316 USD
Retailer 5$19,180 USD
Retailer 4$26,111 USD

4 data points across 13 retailers

11 retailers$1,554 USD to $8,316 USD

A
Cheapest Retailer
-
$1,554 USD
£1,223 GBP
A
Retailer 2
-
$1,663 USD
View
A
Retailer 3
-
$1,929 USD
View
A
Retailer 4
-
$2,100 USD
View
A
Retailer 5
-
$2,266 USD
HK$17,700 HKD
View
A
Retailer 6
-
$2,532 USD
View
A
Retailer 7
-
$2,723 USD
£2,144 GBP
View
A
Retailer 8
-
$3,070 USD
€2,924 EUR
View
A
Retailer 9
-
$3,325 USD
View
B+
Retailer 10
-
$3,615 USD
View
Most Expensive
B
Adiamor
D-82828535 · Oct 31
$8,316 USD
View
10 more retailers have this diamond
Prices start from $1,554 USDSave up to $6,762 USD

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
$1,554 USD