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Round|Natural|IGI

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 648418562

Shape and cutting style on the report: Round brilliant

Certificate IGI 648418562

Diamond specifications and retailer prices

From £1,443 GBP
As of November 6, 2026
Save £2,788 GBP (66%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,231 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 IGI 648418562. Listed at 13 retailers as of November 5, 2026, with prices from £1,443 to £4,231, a £2,788 spread on the same certified stone. NZ Jewellers lists it at £4,231. 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 angle33.4°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 648418562
Dimensions7.47 × 7.42 × 4.46 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
7.47 mm7.42 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 648418562
Side View
Table 58.0%Crown 33.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.0%

Caratlytics Score

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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: £1,443 GBP|Low: £1,443 GBP|High: £3,588 GBP|Avg: £2,192 GBP|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 1£1,443 GBP
Retailer 6£1,812 GBP
Retailer 5£1,840 GBP
Retailer 7£1,846 GBP
Retailer 3£2,222 GBP
Retailer 2£2,671 GBP
Retailer 4£3,536 GBP

38 data points across 7 retailers

13 retailers£1,443 GBP to £4,231 GBP

A
Cheapest Retailer
-
£1,443 GBP
B+
Retailer 2
-
£1,812 GBP
View
A
Retailer 3
-
£1,840 GBP
View
B+
Retailer 4
-
£1,846 GBP
View
B+
Retailer 5
-
£2,024 GBP
View
Retailer 6
-
£2,024 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£2,102 GBP
View
B+
Retailer 8
-
£2,129 GBP
View
A
Retailer 9
-
£2,222 GBP
View
B+
Retailer 10
-
£2,335 GBP
View
B+
Retailer 11
-
£2,671 GBP
View
B+
Retailer 12
-
£3,536 GBP
View
Most Expensive
B
NZ Jewellers
16172003-4e4c-4cee-b131-80db80be7fc9 · Nov 5
£4,231 GBP
$5,695 USD
View
12 more retailers have this diamond
Prices start from £1,443 GBPSave up to £2,788 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
£1,443 GBP