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Round|Natural|GIA

1.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6421142723

Certificate GIA 6421142723

Diamond specifications and retailer prices

From £6,876 GBP
As of November 4, 2026
Save £6,102 GBP (47%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £12,979 GBP at NZ Jewellers · As of November 5, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6421142723. Listed at 18 retailers as of November 4, 2026, with prices from £6,876 to £12,979, a £6,102 spread on the same certified stone. NZ Jewellers lists it at £12,979. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6421142723
Dimensions7.45 × 7.43 × 4.49 mm
L/W Ratio1.00
Top View
7.45 mm7.43 mm1.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421142723
Side View
Table 59.0%CrownGirdle: MediumPavilionCulet: NoneDepth 60.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £12,979 GBP|Low: £6,489 GBP|High: £12,979 GBP|Avg: £9,447 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
November 6, 2026
Retailer 7£6,876 GBP
Retailer 8£7,787 GBP
Retailer 10£7,787 GBP
Retailer 2£8,272 GBP
Retailer 12£8,436 GBP
Retailer 9£8,566 GBP
Retailer 5£9,331 GBP
Retailer 11£9,734 GBP
Retailer 3£10,244 GBP
Retailer 4£11,101 GBP
Retailer 6£12,129 GBP
NZ Jewellers£12,979 GBP

41 data points across 12 retailers

18 retailers£6,876 GBP to £12,979 GBP

B+
Cheapest Retailer
-
£6,876 GBP
B
Retailer 2
-
£7,091 GBP
View
B
Retailer 3
-
£7,225 GBP
View
B
Retailer 4
-
£7,442 GBP
View
Retailer 5
-
£7,787 GBP
View
Price last confirmed 8 days ago
B
Retailer 6
-
£7,787 GBP
View
Final sale: no returns
B
Retailer 7
-
£8,272 GBP
View
B
Retailer 8
-
£8,436 GBP
View
B
Retailer 9
-
£8,566 GBP
View
B
Retailer 10
-
£8,996 GBP
View
B
Retailer 11
-
£9,102 GBP
View
B
Retailer 12
-
£9,102 GBP
View
B
Retailer 13
-
£9,331 GBP
View
B
Retailer 14
-
£9,406 GBP
View
B
Retailer 15
-
£9,734 GBP
View
Retailer 16
-
£10,244 GBP
View
Price last confirmed 14 days ago
B
Retailer 17
-
£12,129 GBP
View
Most Expensive
B
NZ Jewellers
647ee53a-c6df-43c7-89e3-127918a6fd9a · Nov 5
£12,979 GBP
$17,468 USD
View
17 more retailers have this diamond
Prices start from £6,876 GBPSave up to £6,102 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.

B+
1.51ct Round
£6,876 GBP