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Radiant|Natural|GIA

1.51ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 1242094668

Certificate GIA 1242094668

Diamond specifications and retailer prices

From £3,242 GBP
As of November 6, 2026
Save £4,217 GBP (57%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £7,459 GBP at NZ Jewellers · As of November 5, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1242094668. Listed at 8 retailers as of November 5, 2026, with prices from £3,242 to £7,459, a £4,217 spread on the same certified stone. NZ Jewellers lists it at £7,459. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle62.19°
OriginNatural
Grading LabGIA
CertificateGIA 1242094668
Dimensions7.67 × 5.78 × 3.99 mm
L/W Ratio1.33
Key to symbols
Crystal, Pinpoint
Top View
7.67 mm5.78 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1242094668
Side View
Table 65.0%CrownGirdle: STK-THKPavilion 62.19°Culet: NoneDepth 69.1%

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 6
Current: £7,459 GBP|Low: £3,242 GBP|High: £7,621 GBP|Avg: £4,935 GBP|-2.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 7, 2026
Retailer 3£3,242 GBP
Retailer 8£3,776 GBP
Retailer 4£4,163 GBP
Retailer 2£4,412 GBP
Retailer 6£4,459 GBP
Retailer 7£4,691 GBP
Retailer 5£6,552 GBP
NZ Jewellers£7,459 GBP

17 data points across 8 retailers

8 retailers£3,242 GBP to £7,459 GBP

A
Cheapest Retailer
-
£3,242 GBP
Retailer 2
-
£3,776 GBP
View
Price last confirmed 11 days ago
A
Retailer 3
-
£4,163 GBP
View
B+
Retailer 4
-
£4,412 GBP
View
B+
Retailer 5
-
£4,459 GBP
View
B+
Retailer 6
-
£4,691 GBP
View
B
Retailer 7
-
£6,552 GBP
View
Most Expensive
B
NZ Jewellers
ee47447a-7f7b-4857-bbf4-0902d1e940e3 · Nov 5
£7,459 GBP
$9,984 USD
View
7 more retailers have this diamond
Prices start from £3,242 GBPSave up to £4,217 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
£3,242 GBP