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Radiant|Natural|GIA

1.51ct D SI1 Radiant Natural Diamond

VG • D/SI1 • GIA 6555896738

Certificate GIA 6555896738

Diamond specifications and retailer prices

From £4,889 GBP
As of November 1, 2026
Save £2,809 GBP (36%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £8,783 GBP at NZ Jewellers · As of September 20, 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 D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6555896738. Listed at 7 retailers as of November 1, 2026, with a 57% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle53.58°
Pavilion angle38.23°
OriginNatural
Grading LabGIA
CertificateGIA 6555896738
Dimensions7.35 × 5.80 × 4.09 mm
L/W Ratio1.27
Girdle conditionThick
Key to symbols
Crystal, Feather, Needle, Pinpoint
Top View
7.35 mm5.80 mm1.51 ctD / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555896738
Side View
Table 75.0%Crown 53.58°Girdle: SLI-POLPavilion 38.23°Culet: NoneDepth 70.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £4,889 GBP|Low: £4,840 GBP|High: £7,829 GBP|Avg: £5,646 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 1, 2026
Retailer 1£4,889 GBP
Retailer 3£4,971 GBP
Retailer 5£4,971 GBP
Retailer 4£5,071 GBP
Retailer 2£7,697 GBP

35 data points across 5 retailers

7 retailers£4,889 GBP to £7,697 GBP

A
Cheapest Retailer
-
£4,889 GBP
A
Retailer 2
-
£4,971 GBP
$6,660 USD
View
A
Retailer 3
-
£4,971 GBP
$6,660 USD
View
Retailer 4
-
£5,071 GBP
A$10,454 AUD
View
Price last confirmed 11 days ago
Retailer 5
-
£5,251 GBP
$7,036 USD
View
Price last confirmed 40 days ago
B
Retailer 6
-
£7,697 GBP
View
Most Expensive
NZ Jewellers
d1d53a57-48c9-434e-b0e2-7ca3a4344203 · Sep 20
£8,783 GBP
$11,768 USD
View
Price last confirmed 42 days ago
6 more retailers have this diamond
Prices start from £4,889 GBPSave up to £2,809 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
£4,889 GBP