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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2557787831

Certificate GIA 2557787831

Diamond specifications and retailer prices

From £7,874 GBP
As of November 5, 2026
Save £7,209 GBP (48%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £15,083 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2557787831. Listed at 15 retailers as of November 5, 2026, with prices from £7,874 to £15,083, a £7,209 spread on the same certified stone. NZ Jewellers lists it at £15,083. 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

2.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2557787831
Dimensions8.60 × 8.64 × 5.40 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Needle
Top View
8.60 mm8.64 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557787831
Side View
Table 58.0%Crown 36°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 62.7%

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 5
Current: £10,357 GBP|Low: £7,874 GBP|High: £14,285 GBP|Avg: £10,781 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 4£7,874 GBP
Retailer 5£9,497 GBP
Retailer 1£10,357 GBP
Retailer 7£10,656 GBP
Retailer 8£10,822 GBP
Retailer 3£10,868 GBP
Retailer 2£12,427 GBP
Retailer 6£14,096 GBP

29 data points across 8 retailers

15 retailers£7,874 GBP to £15,083 GBP

A
Cheapest Retailer
-
£7,874 GBP
A
Retailer 2
-
£9,157 GBP
View
A
Retailer 3
-
£9,268 GBP
View
A
Retailer 4
-
£9,471 GBP
View
A
Retailer 5
-
£9,497 GBP
View
B+
Retailer 6
-
£9,815 GBP
View
B+
Retailer 7
-
£10,357 GBP
View
B+
Retailer 8
-
£10,656 GBP
View
B+
Retailer 9
-
£10,822 GBP
View
B+
Retailer 10
-
£10,868 GBP
View
B+
Retailer 11
-
£11,090 GBP
View
B+
Retailer 12
-
£11,238 GBP
View
B+
Retailer 13
-
£12,427 GBP
View
B
Retailer 14
-
£14,096 GBP
View
Most Expensive
B
NZ Jewellers
4d6658a7-3260-4822-8dd1-ee7eb8b6e0c0 · Nov 5
£15,083 GBP
$20,301 USD
View
14 more retailers have this diamond
Prices start from £7,874 GBPSave up to £7,209 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
2.51ct Round
£7,874 GBP