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Round|Natural|GIA

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 6531904444

Certificate GIA 6531904444

Diamond specifications and retailer prices

From £1,873 GBP
As of November 6, 2026
Save £2,566 GBP (58%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £4,439 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 K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6531904444. Listed at 14 retailers as of November 5, 2026, with prices from £1,873 to £4,439, a £2,566 spread on the same certified stone. NZ Jewellers lists it at £4,439. 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
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6531904444
Dimensions7.28 × 7.24 × 4.56 mm
L/W Ratio1.01
Top View
7.28 mm7.24 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6531904444
Side View
Table 57.0%Crown 36°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 62.8%

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 6
Current: £4,439 GBP|Low: £1,855 GBP|High: £4,439 GBP|Avg: £2,797 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
November 6, 2026
Retailer 12£1,873 GBP
Retailer 10£1,891 GBP
Retailer 13£2,055 GBP
Retailer 5£2,262 GBP
Retailer 14£2,303 GBP
Retailer 6£2,380 GBP
Retailer 8£2,433 GBP
Retailer 4£2,548 GBP
Retailer 2£2,609 GBP
Retailer 3£2,646 GBP
Retailer 7£2,940 GBP
Retailer 9£2,959 GBP
Retailer 15£3,422 GBP
Retailer 11£4,261 GBP
NZ Jewellers£4,439 GBP

42 data points across 15 retailers

14 retailers£1,873 GBP to £4,439 GBP

A
Cheapest Retailer
-
£1,873 GBP
A
Retailer 2
-
£1,891 GBP
View
A
Retailer 3
-
£2,055 GBP
View
A
Retailer 4
-
£2,262 GBP
View
A
Retailer 5
-
£2,303 GBP
View
A
Retailer 6
-
£2,380 GBP
View
A
Retailer 7
-
£2,433 GBP
View
Retailer 8
-
£2,548 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£2,609 GBP
View
B+
Retailer 10
-
£2,646 GBP
View
B+
Retailer 11
-
£2,940 GBP
View
B+
Retailer 12
-
£2,959 GBP
View
B
Retailer 13
-
£4,261 GBP
View
Most Expensive
B
NZ Jewellers
b756b306-6707-490a-93b1-43e155f92c84 · Nov 5
£4,439 GBP
$5,974 USD
View
13 more retailers have this diamond
Prices start from £1,873 GBPSave up to £2,566 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
£1,873 GBP