CaratHunter
Plans
Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6442187847

Certificate GIA 6442187847

Diamond specifications and retailer prices

From £3,059 GBP
As of November 4, 2026
Save £2,631 GBP (46%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £6,240 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6442187847. Listed at 17 retailers as of November 4, 2026, with a 86% 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6442187847
Dimensions7.47 × 7.46 × 4.47 mm
L/W Ratio1.00
Star length45%
Lower girdle75%
Top View
7.47 mm7.46 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6442187847
Side View
Table 58.0%Crown 32.5°Girdle: Sli. ThickPavilion 40.8°Culet: NoneDepth 59.9%

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: £3,504 GBP|Low: £3,124 GBP|High: £5,774 GBP|Avg: £3,879 GBP|+1.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£3,124 GBP
Retailer 8£3,144 GBP
Retailer 5£3,161 GBP
Retailer 1£3,504 GBP
Retailer 9£3,554 GBP
Retailer 6£3,582 GBP
Retailer 2£4,022 GBP
Retailer 3£4,370 GBP
Retailer 4£5,690 GBP

43 data points across 9 retailers

17 retailers£3,059 GBP to £5,690 GBP

B+
Cheapest Retailer
-
£3,059 GBP
B+
Retailer 2
-
£3,124 GBP
View
B+
Retailer 3
-
£3,144 GBP
View
B+
Retailer 4
-
£3,161 GBP
View
B+
Retailer 5
-
£3,377 GBP
View
B+
Retailer 6
-
£3,504 GBP
View
B+
Retailer 7
-
£3,554 GBP
View
Retailer 8
-
£3,582 GBP
View
Price last confirmed 8 days ago
Retailer 9
-
£3,582 GBP
View
Price last confirmed 29 days ago
B+
Retailer 10
-
£3,582 GBP
View
Retailer 11
-
£3,582 GBP
View
Price last confirmed 38 days ago
B+
Retailer 12
-
£3,693 GBP
View
B
Retailer 13
-
£4,022 GBP
View
Retailer 14
-
£4,133 GBP
View
Price last confirmed 28 days ago
B
Retailer 15
-
£4,370 GBP
View
B
Retailer 16
-
£5,690 GBP
View
Most Expensive
NZ Jewellers
b42a1ff0-1883-493f-9f89-2359ae6447b2 · Sep 28
£6,240 GBP
$8,399 USD
View
Price last confirmed 39 days ago
16 more retailers have this diamond
Prices start from £3,059 GBPSave up to £2,631 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
£3,059 GBP