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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5496366542

Certificate GIA 5496366542

Diamond specifications and retailer prices

From £2,650 GBP
As of November 4, 2026
Save £3,013 GBP (53%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £6,099 GBP at NZ Jewellers · As of October 20, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5496366542. Listed at 16 retailers as of November 4, 2026, with a 114% 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5496366542
Dimensions7.36 × 7.39 × 4.48 mm
L/W Ratio1.00
Star length45%
Lower girdle75%
Top View
7.36 mm7.39 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5496366542
Side View
Table 59.0%Crown 34°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 60.7%

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 4
Current: £3,882 GBP|Low: £2,650 GBP|High: £5,678 GBP|Avg: £3,899 GBP|-0.5%
Retailer 1
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
November 6, 2026
Retailer 14£2,650 GBP
Retailer 12£2,842 GBP
Retailer 4£3,065 GBP
Retailer 2£3,230 GBP
Retailer 3£3,230 GBP
Retailer 7£3,488 GBP
Retailer 5£3,667 GBP
Retailer 6£3,727 GBP
Retailer 1£3,882 GBP
Retailer 13£3,936 GBP
Retailer 9£3,953 GBP
Retailer 10£4,008 GBP
Retailer 8£4,349 GBP
Retailer 11£5,663 GBP

36 data points across 14 retailers

16 retailers£2,650 GBP to £5,663 GBP

A
Cheapest Retailer
-
£2,650 GBP
A
Retailer 2
-
£2,842 GBP
View
B+
Retailer 3
-
£3,065 GBP
View
Retailer 4
-
£3,171 GBP
View
Price last confirmed 21 days ago
Retailer 5
-
£3,230 GBP
View
Price last confirmed 15 days ago
Retailer 6
-
£3,230 GBP
View
Price last confirmed 15 days ago
B+
Retailer 7
-
£3,488 GBP
View
B+
Retailer 8
-
£3,667 GBP
View
Retailer 9
-
£3,727 GBP
View
Price last confirmed 16 days ago
B+
Retailer 10
-
£3,882 GBP
View
Retailer 11
-
£3,936 GBP
View
Price last confirmed 14 days ago
B
Retailer 12
-
£3,953 GBP
View
B
Retailer 13
-
£4,008 GBP
View
B
Retailer 14
-
£4,349 GBP
View
B
Retailer 15
-
£5,663 GBP
View
Most Expensive
NZ Jewellers
9eac41b1-20e5-4cf4-ae86-a3e1d9d3065b · Oct 20
£6,099 GBP
$8,209 USD
View
Price last confirmed 16 days ago
15 more retailers have this diamond
Prices start from £2,650 GBPSave up to £3,013 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
£2,650 GBP