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Radiant|Natural|GIA

1.51ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 1528795927

Certificate GIA 1528795927

Diamond specifications and retailer prices

From £2,857 GBP
As of November 2, 2026
Save £2,389 GBP (46%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £5,246 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1528795927. Listed at 8 retailers as of October 30, 2026, with prices from £2,857 to £5,246, a £2,389 spread on the same certified stone. NZ Jewellers lists it at £5,246. 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
FluorescenceNone
Crown angle48.67°
Pavilion angle31.5°
OriginNatural
Grading LabGIA
CertificateGIA 1528795927
Dimensions7.05 × 5.64 × 3.99 mm
L/W Ratio1.25
Top View
7.05 mm5.64 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1528795927
Side View
Table 65.0%Crown 48.67°Girdle: STK-THKPavilion 31.5°Culet: NoneDepth 70.6%

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 2
Current: £5,246 GBP|Low: £2,737 GBP|High: £5,247 GBP|Avg: £3,475 GBP|-0.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 10£2,737 GBP
Retailer 2£2,857 GBP
Retailer 8£2,870 GBP
Retailer 5£3,011 GBP
Retailer 7£3,011 GBP
Retailer 6£3,118 GBP
Retailer 9£3,230 GBP
Retailer 3£3,249 GBP
Retailer 11£3,259 GBP
Retailer 4£5,036 GBP
NZ Jewellers£5,246 GBP

35 data points across 11 retailers

8 retailers£2,857 GBP to £5,246 GBP

A
Cheapest Retailer
-
£2,857 GBP
A
Retailer 2
-
£2,870 GBP
$3,845 USD
View
A
Retailer 3
-
£3,011 GBP
$4,035 USD
View
A
Retailer 4
-
£3,011 GBP
$4,035 USD
View
A
Retailer 5
-
£3,118 GBP
$4,178 USD
View
Retailer 6
-
£3,230 GBP
A$6,658 AUD
View
Price last confirmed 29 days ago
B+
Retailer 7
-
£5,036 GBP
View
Most Expensive
B
NZ Jewellers
4b7c664d-ceb4-4377-accf-6acf1e770705 · Oct 30
£5,246 GBP
$7,029 USD
View
7 more retailers have this diamond
Prices start from £2,857 GBPSave up to £2,389 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
£2,857 GBP