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Radiant|Natural|GIA

1.51ct I SI2 Radiant Natural Diamond

ID • I/SI2 • GIA 1518170862

Certificate GIA 1518170862

Diamond specifications and retailer prices

From £2,977 GBP
As of November 1, 2026
Save £2,340 GBP (44%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £5,318 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 I 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 1518170862. Listed at 6 retailers as of October 30, 2026, with prices from £2,977 to £5,318, a £2,340 spread on the same certified stone. NZ Jewellers lists it at £5,318. 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
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.77°
Pavilion angle31.26°
OriginNatural
Grading LabGIA
CertificateGIA 1518170862
Dimensions7.73 × 5.92 × 3.71 mm
L/W Ratio1.31
Girdle conditionSlightly Thick
Key to symbols
Crystal, Twinning Wisp, Feather, Needle
Top View
7.73 mm5.92 mm1.51 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1518170862
Side View
Table 70.0%Crown 44.77°Girdle: MediumPavilion 31.26°Culet: NoneDepth 62.7%

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 1
Current: £5,318 GBP|Low: £2,976 GBP|High: £5,388 GBP|Avg: £3,695 GBP|-1.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2£2,977 GBP
Retailer 4£3,052 GBP
Retailer 5£3,052 GBP
Retailer 6£3,158 GBP
Retailer 9£3,211 GBP
Retailer 7£3,461 GBP
Retailer 8£3,481 GBP
Retailer 10£3,590 GBP
Retailer 3£5,104 GBP
NZ Jewellers£5,318 GBP

34 data points across 10 retailers

6 retailers£2,977 GBP to £5,318 GBP

A
Cheapest Retailer
-
£2,977 GBP
A
Retailer 2
-
£3,052 GBP
$4,089 USD
View
A
Retailer 3
-
£3,052 GBP
$4,089 USD
View
A
Retailer 4
-
£3,158 GBP
$4,232 USD
View
B+
Retailer 5
-
£5,104 GBP
View
Most Expensive
B
NZ Jewellers
84c6226e-ee67-4228-a4df-b55c55477ffb · Oct 30
£5,318 GBP
$7,125 USD
View
5 more retailers have this diamond
Prices start from £2,977 GBPSave up to £2,340 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
£2,977 GBP