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Round|Natural|IGI

1.51ct K I1 Round Natural Diamond

EX • K/I1 • IGI 779666789

Shape and cutting style on the report: Round brilliant

Certificate IGI 779666789

Diamond specifications and retailer prices

From £1,028 GBP
As of November 6, 2026
Save £733 GBP (42%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £3,171 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 I1 clarity (included), with a top-tier cut grade and certified by IGI 779666789. Listed at 8 retailers as of November 5, 2026, with a 71% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
K
Colour
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle32°
Pavilion angle41.7°
OriginNatural
Grading LabIGI
CertificateIGI 779666789
Dimensions7.39 × 7.44 × 4.50 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.39 mm7.44 mm1.51 ctK / I1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 779666789
Side View
Table 59.0%Crown 32°Girdle: MED-STKPavilion 41.7°Culet: NoneDepth 60.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £3,171 GBP|Low: £1,028 GBP|High: £3,171 GBP|Avg: £1,668 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£1,028 GBP
Retailer 5£1,185 GBP
Retailer 4£1,300 GBP
Retailer 6£1,547 GBP
Retailer 3£1,762 GBP
NZ Jewellers£3,171 GBP

42 data points across 6 retailers

8 retailers£1,028 GBP to £1,762 GBP

A
Cheapest Retailer
-
£1,028 GBP
B+
Retailer 2
-
£1,185 GBP
View
Retailer 3
-
£1,300 GBP
View
Price last confirmed 17 days ago
Retailer 4
-
£1,300 GBP
View
Price last confirmed 25 days ago
Retailer 5
-
£1,360 GBP
View
Price last confirmed 22 days ago
Retailer 6
-
£1,500 GBP
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£1,762 GBP
View
Most Expensive
NZ Jewellers
99e1c3c0-fe41-4272-878e-2422cd78c45d · Oct 20
£3,171 GBP
$4,268 USD
View
Price last confirmed 16 days ago
7 more retailers have this diamond
Prices start from £1,028 GBPSave up to £733 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
£1,028 GBP