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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6491354443

Certificate GIA 6491354443

Diamond specifications and retailer prices

From £1,693 GBP
As of November 6, 2026
Save £2,104 GBP (55%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,966 GBP at NZ Jewellers · As of September 19, 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 6491354443. Listed at 16 retailers as of November 4, 2026, with a 124% 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
FluorescenceFaint
Crown angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6491354443
Dimensions7.37 × 7.32 × 4.50 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.37 mm7.32 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6491354443
Side View
Table 60.0%Crown 34.5°Girdle: ThickPavilion 40.8°Culet: NoneDepth 61.2%

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: £2,360 GBP|Low: £1,635 GBP|High: £3,852 GBP|Avg: £2,383 GBP
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
November 6, 2026
Retailer 11£1,693 GBP
Retailer 2£2,039 GBP
Retailer 3£2,040 GBP
Retailer 10£2,054 GBP
Retailer 13£2,099 GBP
Retailer 12£2,238 GBP
Retailer 4£2,277 GBP
Retailer 6£2,338 GBP
Retailer 1£2,360 GBP
Retailer 5£2,383 GBP
Retailer 7£2,644 GBP
Retailer 8£2,779 GBP
Retailer 9£3,797 GBP

43 data points across 13 retailers

16 retailers£1,693 GBP to £3,797 GBP

A
Cheapest Retailer
-
£1,693 GBP
A
Retailer 2
-
£2,039 GBP
View
A
Retailer 3
-
£2,040 GBP
View
A
Retailer 4
-
£2,054 GBP
View
A
Retailer 5
-
£2,099 GBP
View
A
Retailer 6
-
£2,238 GBP
View
Retailer 7
-
£2,277 GBP
View
Price last confirmed 49 days ago
Retailer 8
-
£2,277 GBP
View
Price last confirmed 25 days ago
A
Retailer 9
-
£2,338 GBP
View
A
Retailer 10
-
£2,360 GBP
View
A
Retailer 11
-
£2,383 GBP
View
Retailer 12
-
£2,626 GBP
View
Price last confirmed 48 days ago
A
Retailer 13
-
£2,644 GBP
View
B+
Retailer 14
-
£2,779 GBP
View
B
Retailer 15
-
£3,797 GBP
View
Most Expensive
NZ Jewellers
665bc02b-f100-4dc7-8719-186e063fbfef · Sep 19
£3,966 GBP
$5,338 USD
View
Price last confirmed 48 days ago
15 more retailers have this diamond
Prices start from £1,693 GBPSave up to £2,104 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
£1,693 GBP