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Radiant|Natural|GIA

1.51ct J SI2 Radiant Natural Diamond

ID • J/SI2 • GIA 1509049420

Certificate GIA 1509049420

Diamond specifications and retailer prices

From £1,766 GBP
As of October 31, 2026
Save £2,157 GBP (55%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £3,923 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant 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 stated by the retailer rather than the lab and certified by GIA 1509049420. Listed at 7 retailers as of October 30, 2026, with prices from £1,766 to £3,923, a £2,157 spread on the same certified stone. NZ Jewellers lists it at £3,923. 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
J
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.94°
Pavilion angle30.54°
OriginNatural
Grading LabGIA
CertificateGIA 1509049420
Dimensions7.29 × 5.66 × 3.86 mm
L/W Ratio1.29
Girdle conditionVery Thick
Key to symbols
Crystal, Cloud, Needle
Top View
7.29 mm5.66 mm1.51 ctJ / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1509049420
Side View
Table 68.0%Crown 46.94°Girdle: ThickPavilion 30.54°Culet: NoneDepth 68.2%

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: Oct 31
Current: £3,923 GBP|Low: £1,712 GBP|High: £4,041 GBP|Avg: £2,463 GBP|-2.9%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 2£1,766 GBP
Retailer 3£1,861 GBP
Retailer 6£1,876 GBP
Retailer 5£1,963 GBP
Retailer 7£1,984 GBP
Retailer 4£3,292 GBP
NZ Jewellers£3,923 GBP

40 data points across 7 retailers

7 retailers£1,766 GBP to £3,923 GBP

A
Cheapest Retailer
-
£1,766 GBP
A
Retailer 2
-
£1,861 GBP
View
A
Retailer 3
-
£1,876 GBP
$2,514 USD
View
A
Retailer 4
-
£1,963 GBP
$2,630 USD
View
A
Retailer 5
-
£1,984 GBP
$2,659 USD
View
B+
Retailer 6
-
£3,292 GBP
View
Most Expensive
B
NZ Jewellers
2e6e491d-5770-4b9f-a3a8-e7cd0dc121c4 · Oct 30
£3,923 GBP
$5,257 USD
View
6 more retailers have this diamond
Prices start from £1,766 GBPSave up to £2,157 GBP

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 Radiant
£1,766 GBP