Round|Lab Grown|IGI

1.51ct J SI2 Round Lab Grown Diamond

EX • J/SI2

Diamond specifications and retailer prices

From £3,889 GBP

$5,211 USD

As of October 29, 2026

2 retailers carry this diamond

Most expensive: £3,889 GBP at Blue Nile

View at Blue Nile

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 J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 2 retailers as of October 29, 2026. 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

Colour

SI2

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

OriginLab Grown

Grading LabIGI

Dimensions7.29 × 7.33 × 4.60 mm

L/W Ratio1.01

Top View

OriginLab Grown

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI

Side View

Caratlytics Score

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Average

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Price History

Last verified: Oct 29

Current: £3,889 GBP|Low: £3,011 GBP|High: £4,005 GBP|Avg: £3,472 GBP|-2.9%

Blue Nile

Retailer 2

October 20, 2026

Retailer 2£3,011 GBP

Blue Nile£3,889 GBP

6 data points across 2 retailers

2 retailers

Retailer 1

£3,011 GBP

$4,034 USD

Price last confirmed 10 days ago

Most Expensive

Blue Nile

28057949 · Oct 29

£3,889 GBP

$5,211 USD

View

1 more retailer has this diamond

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.

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1.51ct Round

£3,889 GBP