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Round|Lab Grown|IGI

8.31ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG595371329

Shape and cutting style on the report: Round brilliant

Certificate IGI LG595371329

Diamond specifications and retailer prices

From $1,153 USD
As of October 29, 2026
Save $4,271 USD (79%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $5,424 USD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 8.31ct lab-grown round diamond

This 8.31ct lab-grown round sits in the over five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG595371329 or 595371329. Listed at 15 retailers as of October 29, 2026, with prices from $1,153 to $5,424, a $4,271 spread on the same certified stone. Blue Nile lists it at $5,424. 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

8.31
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG595371329
Dimensions13.00 × 12.92 × 7.98 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
13.00 mm12.92 mm8.31 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG595371329
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $5,424 USD|Low: $1,006 USD|High: $5,424 USD|Avg: $2,265 USD
Blue Nile
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
October 31, 2026
Retailer 8$1,127 USD
Retailer 4$1,153 USD
Retailer 9$1,167 USD
Retailer 12$1,255 USD
Retailer 17$1,338 USD
Retailer 16$1,360 USD
Retailer 10$1,510 USD
Retailer 6$1,876 USD
Retailer 2$1,907 USD
Retailer 11$1,933 USD
Retailer 5$2,124 USD
Retailer 3$2,507 USD
Retailer 13$2,636 USD
Retailer 15$4,321 USD
Retailer 14$4,771 USD
Retailer 7$5,400 USD
Blue Nile$5,424 USD

41 data points across 17 retailers

15 retailers$1,153 USD to $5,424 USD

A
Cheapest Retailer
-
$1,153 USD
A
Retailer 2
-
$1,255 USD
View
A
Retailer 3
-
$1,338 USD
View
Retailer 4
-
$1,360 USD
£1,071 GBP
View
Price last confirmed 14 days ago
A
Retailer 5
-
$1,510 USD
View
B+
Retailer 6
-
$1,876 USD
View
B+
Retailer 7
-
$1,907 USD
€1,816 EUR
View
B+
Retailer 8
-
$1,933 USD
£1,522 GBP
View
B+
Retailer 9
-
$2,124 USD
View
B+
Retailer 10
-
$2,507 USD
View
B+
Retailer 11
-
$2,636 USD
View
B
Retailer 12
-
$4,321 USD
£3,402 GBP
View
B
Retailer 13
-
$4,771 USD
View
B
Retailer 14
-
$5,400 USD
View
Most Expensive
B
Blue Nile
25246920 · Oct 31
$5,424 USD
View
14 more retailers have this diamond
Prices start from $1,153 USDSave up to $4,271 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
8.31ct Round
$1,153 USD