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Round|Lab Grown|IGI

1.51ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451056217

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056217

Diamond specifications and retailer prices

From €748 EUR
As of November 5, 2026
Save €3,813 EUR (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €4,561 EUR at MOH London · As of November 3, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056217 or 451056217. Listed at 11 retailers as of November 3, 2026, with prices from €748 to €4,561, a €3,813 spread on the same certified stone. MOH London lists it at €4,561. 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

1.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056217
Dimensions7.32 × 7.40 × 4.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.32 mm7.40 mm1.51 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056217
Side View
Table 61.0%Crown 36°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.4%

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: Nov 5
Current: €4,561 EUR|Low: €748 EUR|High: €4,622 EUR|Avg: €2,269 EUR
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2€748 EUR
Retailer 3€1,224 EUR
Retailer 6€1,369 EUR
Retailer 4€1,419 EUR
Retailer 7€1,573 EUR
Retailer 9€1,942 EUR
Retailer 5€2,243 EUR
Retailer 8€2,646 EUR
Retailer 10€4,063 EUR
MOH London€4,561 EUR

14 data points across 10 retailers

11 retailers€748 EUR to €4,561 EUR

A
Cheapest Retailer
-
€748 EUR
B+
Retailer 2
-
€1,224 EUR
View
B+
Retailer 3
-
€1,331 EUR
View
B+
Retailer 4
-
€1,369 EUR
View
Final sale: no returns
B+
Retailer 5
-
€1,419 EUR
View
Retailer 6
-
€1,419 EUR
View
Price last confirmed 25 days ago
B
Retailer 7
-
€1,573 EUR
View
B
Retailer 8
-
€2,243 EUR
View
B
Retailer 9
-
€2,646 EUR
View
B
Retailer 10
-
€2,661 EUR
View
Most Expensive
B
MOH London
LG451056217 · Nov 3
€4,561 EUR
£4,031 GBP
View
10 more retailers have this diamond
Prices start from €748 EURSave up to €3,813 EUR

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
1.51ct Round
€748 EUR