Round|Natural|GIA

2.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 2556315284

Certificate GIA 2556315284

Diamond specifications and retailer prices

From £7,625 GBP
As of November 6, 2026
Save £3,409 GBP (31%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £11,806 GBP at NZ Jewellers · As of October 3, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556315284. Listed at 11 retailers as of November 4, 2026, with a 45% 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

2.51
Carat
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2556315284
Dimensions8.58 × 8.65 × 5.41 mm
L/W Ratio1.01
Star length50%
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
8.58 mm8.65 mm2.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556315284
Side View
Table 58.0%Crown 36°GirdlePavilion 40.8°Culet: NoneDepth 62.8%

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: £11,806 GBP|Low: £7,624 GBP|High: £11,806 GBP|Avg: £9,480 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3£7,625 GBP
Retailer 6£7,819 GBP
Retailer 8£8,471 GBP
Retailer 4£8,856 GBP
Retailer 7£9,774 GBP
Retailer 2£10,063 GBP
Retailer 5£11,033 GBP
NZ Jewellers£11,806 GBP

38 data points across 8 retailers

11 retailers£7,625 GBP to £11,033 GBP

A
Cheapest Retailer
-
£7,625 GBP
Retailer 2
-
£7,819 GBP
View
Price last confirmed 29 days ago
Retailer 3
-
£7,819 GBP
View
Price last confirmed 12 days ago
Retailer 4
-
£7,819 GBP
View
Price last confirmed 8 days ago
Retailer 5
-
£8,471 GBP
View
Price last confirmed 29 days ago
Retailer 6
-
£8,564 GBP
View
Price last confirmed 38 days ago
A
Retailer 7
-
£8,856 GBP
View
Retailer 8
-
£9,774 GBP
View
Price last confirmed 35 days ago
B+
Retailer 9
-
£10,063 GBP
View
B+
Retailer 10
-
£11,033 GBP
View
Most Expensive
NZ Jewellers
570a218d-0d78-4d62-9c53-7a3c13617865 · Oct 3
£11,806 GBP
$15,890 USD
View
Price last confirmed 33 days ago
10 more retailers have this diamond
Prices start from £7,625 GBPSave up to £3,409 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
£7,625 GBP