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1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • IGI 754512199

Shape and cutting style on the report: Round brilliant

Certificate IGI 754512199

Diamond specifications and retailer prices

From £1,596 GBP
As of November 6, 2026
Save £2,557 GBP (62%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,153 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 754512199. Listed at 19 retailers as of November 5, 2026, with prices from £1,596 to £4,153, a £2,557 spread on the same certified stone. NZ Jewellers lists it at £4,153. 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 angle36.7°
Pavilion angle40.5°
OriginNatural
Grading LabIGI
CertificateIGI 754512199
Dimensions7.17 × 7.23 × 4.57 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.17 mm7.23 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 754512199
Side View
Table 56.0%Crown 36.7°Girdle: Slightly ThickPavilion 40.5°Culet: NoneDepth 63.5%

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: £1,596 GBP|Low: £1,596 GBP|High: £3,522 GBP|Avg: £2,182 GBP|-2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1£1,596 GBP
Retailer 9£1,709 GBP
Retailer 6£1,801 GBP
Retailer 2£1,958 GBP
Retailer 10£2,018 GBP
Retailer 3£2,127 GBP
Retailer 4£2,326 GBP
Retailer 5£2,424 GBP
Retailer 7£2,453 GBP
Retailer 8£3,471 GBP

33 data points across 10 retailers

19 retailers£1,596 GBP to £4,153 GBP

A
Cheapest Retailer
-
£1,596 GBP
A
Retailer 2
-
£1,709 GBP
View
A
Retailer 3
-
£1,779 GBP
View
A
Retailer 4
-
£1,801 GBP
View
B+
Retailer 5
-
£1,958 GBP
View
Retailer 6
-
£1,987 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£1,987 GBP
View
A
Retailer 8
-
£2,018 GBP
View
B+
Retailer 9
-
£2,022 GBP
View
B+
Retailer 10
-
£2,063 GBP
View
B+
Retailer 11
-
£2,092 GBP
View
A
Retailer 12
-
£2,127 GBP
View
B+
Retailer 13
-
£2,292 GBP
View
A
Retailer 14
-
£2,326 GBP
View
A
Retailer 15
-
£2,424 GBP
View
A
Retailer 16
-
£2,453 GBP
View
B+
Retailer 17
-
£3,048 GBP
View
B+
Retailer 18
-
£3,471 GBP
View
Most Expensive
B
NZ Jewellers
506969c5-90e3-475c-97b0-c094ff3fa585 · Nov 5
£4,153 GBP
$5,590 USD
View
18 more retailers have this diamond
Prices start from £1,596 GBPSave up to £2,557 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
£1,596 GBP