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1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 6491766711

Shape and cutting style on the report: Round brilliant

Certificate GIA 6491766711

Diamond specifications and retailer prices

From £3,405 GBP
As of November 4, 2026
Save £3,803 GBP (53%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £7,208 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 GIA 6491766711. Listed at 15 retailers as of November 4, 2026, with prices from £3,405 to £7,208, a £3,803 spread on the same certified stone. NZ Jewellers lists it at £7,208. 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 angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6491766711
Dimensions7.34 × 7.31 × 4.56 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
7.34 mm7.31 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6491766711
Side View
Table 56.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £4,685 GBP|Low: £3,405 GBP|High: £6,426 GBP|Avg: £4,378 GBP|-0.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 9£3,405 GBP
Retailer 5£3,447 GBP
Retailer 7£3,447 GBP
Retailer 8£3,635 GBP
Retailer 2£3,905 GBP
Retailer 3£4,135 GBP
Retailer 1£4,685 GBP
Retailer 6£4,693 GBP
Retailer 10£5,789 GBP
Retailer 4£6,333 GBP

43 data points across 10 retailers

15 retailers£3,405 GBP to £7,208 GBP

B+
Cheapest Retailer
-
£3,405 GBP
B+
Retailer 2
-
£3,447 GBP
View
B+
Retailer 3
-
£3,447 GBP
View
B+
Retailer 4
-
£3,635 GBP
View
B
Retailer 5
-
£3,864 GBP
View
Retailer 6
-
£3,905 GBP
View
Price last confirmed 8 days ago
B
Retailer 7
-
£3,905 GBP
View
B
Retailer 8
-
£3,905 GBP
View
B+
Retailer 9
-
£4,135 GBP
View
B
Retailer 10
-
£4,505 GBP
View
B
Retailer 11
-
£4,685 GBP
View
B
Retailer 12
-
£4,693 GBP
View
Retailer 13
-
£4,754 GBP
View
Price last confirmed 14 days ago
B
Retailer 14
-
£6,333 GBP
View
Most Expensive
B
NZ Jewellers
2ebd30b8-ea8c-4b5d-85d4-042f8b38b488 · Nov 5
£7,208 GBP
$9,702 USD
View
14 more retailers have this diamond
Prices start from £3,405 GBPSave up to £3,803 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.

B+
1.51ct Round
£3,405 GBP