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1.51ct H SI1 Round Lab Grown Diamond

EX • H/SI1 • IGI LG851661425

Shape and cutting style on the report: Round brilliant

Certificate IGI LG851661425

Diamond specifications and retailer prices

From €347 EUR
$388 USD
As of November 1, 2026
Save €567 EUR (62%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: €914 EUR at MOH London · As of November 1, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG851661425 or 851661425. Listed at 4 retailers as of November 1, 2026, with prices from €347 to €914, a €567 spread on the same certified stone. MOH London lists it at €914. 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
H
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG851661425
Dimensions7.39 × 7.44 × 4.53 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.39 mm7.44 mm1.51 ctH / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG851661425
Side View
Table 59.0%Crown 33.1°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 61.1%

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: Nov 1
Current: €914 EUR|Low: €347 EUR|High: €920 EUR|Avg: €593 EUR|-0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 1, 2026
Retailer 3€347 EUR
Retailer 2€495 EUR
Retailer 4€496 EUR
MOH London€914 EUR

3 data points across 4 retailers

4 retailers€347 EUR to €914 EUR

B+
Cheapest Retailer
-
€347 EUR
$388 USD
A
Retailer 2
-
€495 EUR
$553 USD
View
A
Retailer 3
-
€496 EUR
$554 USD
View
Most Expensive
B+
MOH London
LG851661425 · Nov 1
€914 EUR
£804 GBP
View
3 more retailers have this diamond
Prices start from €347 EURSave up to €567 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
€347 EUR