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Cushion|Lab Grown|IGI

2.55ct G SI1 Cushion Lab Grown Diamond

ID • G/SI1 • IGI LG500151307

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG500151307

Diamond specifications and retailer prices

From $2,010 USD
As of October 31, 2026
Save $4,210 USD (68%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $7,328 USD at Loose Grown Diamond · As of November 1, 2026
View at Loose Grown Diamond

About this 2.55ct lab-grown cushion diamond

This 2.55ct lab-grown cushion sits in the two to three carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG500151307 or 500151307. Listed at 10 retailers as of October 31, 2026, with a 209% 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

2.55
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle32.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG500151307
Dimensions7.86 × 7.51 × 4.74 mm
L/W Ratio1.05
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
7.86 mm7.51 mm2.55 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG500151307
Side View
Table 65.0%Crown 36.6°Girdle: STK-VTKPavilion 32.4°Culet: NoneDepth 63.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $7,328 USD|Low: $2,010 USD|High: $10,272 USD|Avg: $5,940 USD
Loose Grown Diamond
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 5$2,010 USD
Retailer 7$4,568 USD
Retailer 6$4,732 USD
Retailer 4$6,220 USD
Retailer 3$6,391 USD
Loose Grown Diamond$7,328 USD
Retailer 2$10,136 USD

43 data points across 7 retailers

10 retailers$2,010 USD to $6,220 USD

B+
Cheapest Retailer
-
$2,010 USD
B
Retailer 2
-
$4,307 USD
View
B
Retailer 3
-
$4,568 USD
View
Final sale: no returns
Retailer 4
-
$4,732 USD
View
Price last confirmed 21 days ago
B
Retailer 5
-
$4,785 USD
View
B
Retailer 6
-
$6,220 USD
£4,898 GBP
View
Retailer 7
-
$6,391 USD
£5,032 GBP
View
Price under review
Most Expensive
Loose Grown Diamond
500151307 · Nov 1
$7,328 USD
View
Price under review
7 more retailers have this diamond
Prices start from $2,010 USDSave up to $4,210 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.

B+
2.55ct Cushion
$2,010 USD