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Radiant|Natural|IGI

1.51ct H SI1 Radiant Natural Diamond

VG • H/SI1 • IGI 828653791

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI 828653791

Diamond specifications and retailer prices

From £3,148 GBP
As of November 6, 2026
Save £3,236 GBP (51%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £6,384 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 828653791. Listed at 16 retailers as of November 5, 2026, with prices from £3,148 to £6,384, a £3,236 spread on the same certified stone. NZ Jewellers lists it at £6,384. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
H
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle51.1°
Pavilion angle28.7°
OriginNatural
Grading LabIGI
CertificateIGI 828653791
Dimensions7.61 × 5.56 × 3.71 mm
L/W Ratio1.37
Culet sizeNone
Top View
7.61 mm5.56 mm1.51 ctH / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 828653791
Side View
Table 67.0%Crown 51.1°Girdle: STK-THKPavilion 28.7°Culet: NoneDepth 66.7%

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 6
Current: £6,384 GBP|Low: £3,148 GBP|High: £6,513 GBP|Avg: £4,019 GBP|-2.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 7, 2026
Retailer 12£3,148 GBP
Retailer 2£3,198 GBP
Retailer 11£3,331 GBP
Retailer 6£3,356 GBP
Retailer 13£3,382 GBP
Retailer 9£3,609 GBP
Retailer 10£3,622 GBP
Retailer 7£3,636 GBP
Retailer 5£3,664 GBP
Retailer 14£3,721 GBP
Retailer 8£3,738 GBP
Retailer 15£3,837 GBP
Retailer 16£4,164 GBP
Retailer 3£4,471 GBP
Retailer 4£5,820 GBP
NZ Jewellers£6,384 GBP

15 data points across 16 retailers

16 retailers£3,148 GBP to £6,384 GBP

A
Cheapest Retailer
-
£3,148 GBP
A
Retailer 2
-
£3,198 GBP
View
A
Retailer 3
-
£3,331 GBP
View
Final sale: no returns
A
Retailer 4
-
£3,356 GBP
View
A
Retailer 5
-
£3,382 GBP
View
A
Retailer 6
-
£3,609 GBP
View
A
Retailer 7
-
£3,622 GBP
View
B+
Retailer 8
-
£3,636 GBP
View
A
Retailer 9
-
£3,664 GBP
View
A
Retailer 10
-
£3,721 GBP
View
Retailer 11
-
£3,738 GBP
View
Price last confirmed 9 days ago
A
Retailer 12
-
£3,837 GBP
View
B+
Retailer 13
-
£4,164 GBP
View
B+
Retailer 14
-
£4,471 GBP
View
B
Retailer 15
-
£5,820 GBP
View
Most Expensive
B
NZ Jewellers
f83d0672-7283-49fd-af05-b905100c3c1f · Nov 5
£6,384 GBP
$8,545 USD
View
15 more retailers have this diamond
Prices start from £3,148 GBPSave up to £3,236 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
£3,148 GBP