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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566495423

Certificate GIA 2566495423

Diamond specifications and retailer prices

From £3,433 GBP
As of November 1, 2026
Save £3,313 GBP (49%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £7,659 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round 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 and certified by GIA 2566495423. Listed at 18 retailers as of November 1, 2026, with a 96% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2566495423
Dimensions7.33 × 7.37 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Pinpoint, Indented Natural
Top View
7.33 mm7.37 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566495423
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 41°Culet: NoneDepth 61.8%

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: £7,659 GBP|Low: £3,404 GBP|High: £7,659 GBP|Avg: £4,795 GBP
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
Retailer 17
Retailer 18
November 2, 2026
Retailer 17£3,433 GBP
Retailer 13£3,641 GBP
Retailer 9£3,916 GBP
Retailer 8£4,015 GBP
Retailer 14£4,016 GBP
Retailer 11£4,364 GBP
Retailer 5£4,579 GBP
Retailer 6£4,579 GBP
Retailer 10£4,579 GBP
Retailer 3£4,651 GBP
Retailer 7£4,696 GBP
Retailer 2£4,709 GBP
Retailer 18£4,790 GBP
Retailer 12£4,982 GBP
Retailer 4£5,284 GBP
Retailer 16£5,626 GBP
Retailer 15£6,746 GBP
NZ Jewellers£7,659 GBP

11 data points across 18 retailers

18 retailers£3,433 GBP to £6,746 GBP

A
Cheapest Retailer
-
£3,433 GBP
A
Retailer 2
-
£3,641 GBP
View
Retailer 3
-
£3,916 GBP
View
Price last confirmed 10 days ago
A
Retailer 4
-
£4,015 GBP
View
A
Retailer 5
-
£4,016 GBP
View
B+
Retailer 6
-
£4,364 GBP
View
Retailer 7
-
£4,579 GBP
View
Price last confirmed 8 days ago
Retailer 8
-
£4,579 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£4,579 GBP
View
B+
Retailer 10
-
£4,651 GBP
View
B+
Retailer 11
-
£4,696 GBP
View
B+
Retailer 12
-
£4,709 GBP
View
B+
Retailer 13
-
£4,790 GBP
View
B+
Retailer 14
-
£4,982 GBP
View
B+
Retailer 15
-
£5,284 GBP
View
B
Retailer 16
-
£5,626 GBP
View
B
Retailer 17
-
£6,746 GBP
View
Most Expensive
NZ Jewellers
ff341407-2ec3-4de4-9297-4dde2b7d59ee · Oct 30
£7,659 GBP
$10,252 USD
View
Price last confirmed 7 days ago
17 more retailers have this diamond
Prices start from £3,433 GBPSave up to £3,313 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 Round
£3,433 GBP