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Round|Lab Grown|IGI

2.57ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG731507717

Shape and cutting style on the report: Round brilliant

Certificate IGI LG731507717

Diamond specifications and retailer prices

From $296 USD
As of October 29, 2026
Save $1,954 USD (87%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $2,250 USD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 2.57ct lab-grown round diamond

This 2.57ct lab-grown round sits in the two to three carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG731507717 or 731507717. Listed at 20 retailers as of October 29, 2026, with prices from $296 to $2,250, a $1,954 spread on the same certified stone. Brilliant Earth lists it at $2,250. 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

2.57
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731507717
Dimensions8.87 × 8.79 × 5.44 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
8.87 mm8.79 mm2.57 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731507717
Side View
Table 55.0%Crown 33°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.6%

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 29
Current: $2,250 USD|Low: $288 USD|High: $2,500 USD|Avg: $811 USD|-10.0%
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
October 30, 2026
Retailer 6$296 USD
Retailer 9$336 USD
Retailer 13$343 USD
Retailer 3$367 USD
Retailer 4$367 USD
Retailer 5$492 USD
Retailer 12$525 USD
Retailer 2$553 USD
Retailer 11$600 USD
Retailer 10$647 USD
Retailer 15$688 USD
Retailer 17$744 USD
Retailer 14$938 USD
Retailer 7$1,179 USD
Retailer 16$1,477 USD
Retailer 8$1,530 USD
Brilliant Earth$2,250 USD

43 data points across 17 retailers

20 retailers$296 USD to $2,250 USD

A
Cheapest Retailer
-
$296 USD
A
Retailer 2
-
$336 USD
View
Final sale: no returns
A
Retailer 3
-
$343 USD
View
A
Retailer 4
-
$367 USD
View
A
Retailer 5
-
$367 USD
View
B+
Retailer 6
-
$492 USD
View
A
Retailer 7
-
$525 USD
View
A
Retailer 8
-
$553 USD
£435 GBP
View
A
Retailer 9
-
$600 USD
€571 EUR
View
A
Retailer 10
-
$647 USD
£509 GBP
View
A
Retailer 11
-
$688 USD
A$1,058 AUD
View
A
Retailer 12
-
$744 USD
View
A
Retailer 13
-
$776 USD
View
B+
Retailer 14
-
$938 USD
View
Retailer 15
-
$1,042 USD
View
Price last confirmed 44 days ago
B+
Retailer 16
-
$1,179 USD
View
B+
Retailer 17
-
$1,477 USD
£1,163 GBP
View
Retailer 18
-
$1,515 USD
View
Price last confirmed 9 days ago
Retailer 19
-
$1,530 USD
View
Price last confirmed 16 days ago
Most Expensive
B
Brilliant Earth
15692000A · Oct 30
$2,250 USD
View
19 more retailers have this diamond
Prices start from $296 USDSave up to $1,954 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
2.57ct Round
$296 USD