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Round|Natural|IGI

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 717555550

Shape and cutting style on the report: Round brilliant

Certificate IGI 717555550

Diamond specifications and retailer prices

From £791 GBP
As of November 6, 2026
Save £983 GBP (55%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,369 GBP at NZ Jewellers · As of September 28, 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 IGI 717555550. Listed at 11 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.7°
OriginNatural
Grading LabIGI
CertificateIGI 717555550
Dimensions7.27 × 7.22 × 4.60 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.27 mm7.22 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 717555550
Side View
Table 56.0%Crown 36.4°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 63.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £791 GBP|Low: £791 GBP|High: £1,800 GBP|Avg: £1,142 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 1£791 GBP
Retailer 4£900 GBP
Retailer 6£971 GBP
Retailer 5£1,071 GBP
Retailer 2£1,282 GBP
Retailer 3£1,774 GBP

42 data points across 6 retailers

11 retailers£791 GBP to £1,774 GBP

A
Cheapest Retailer
-
£791 GBP
A
Retailer 2
-
£900 GBP
View
Retailer 3
-
£971 GBP
View
Price last confirmed 39 days ago
Retailer 4
-
£971 GBP
View
Price last confirmed 25 days ago
Retailer 5
-
£971 GBP
View
Price last confirmed 29 days ago
Retailer 6
-
£1,016 GBP
View
Price last confirmed 38 days ago
A
Retailer 7
-
£1,071 GBP
View
Retailer 8
-
£1,120 GBP
View
Price last confirmed 38 days ago
A
Retailer 9
-
£1,282 GBP
View
A
Retailer 10
-
£1,774 GBP
View
Most Expensive
NZ Jewellers
593dcbd2-02db-43f1-9a03-0e5bf40204e8 · Sep 28
£2,369 GBP
$3,188 USD
View
Price last confirmed 39 days ago
10 more retailers have this diamond
Prices start from £791 GBPSave up to £983 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
£791 GBP