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Round|Natural|IGI

2.51ct H SI1 Round Natural Diamond

EX • H/SI1 • IGI 773617951

Shape and cutting style on the report: Round brilliant

Certificate IGI 773617951

Diamond specifications and retailer prices

From £10,307 GBP
$13,810 USD
As of November 1, 2026
Save £7,739 GBP (43%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £21,101 GBP at Aurelinne · As of October 21, 2026
View at Aurelinne

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 773617951. Listed at 13 retailers as of November 1, 2026, with a 75% 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabIGI
CertificateIGI 773617951
Dimensions8.59 × 8.65 × 5.43 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
8.59 mm8.65 mm2.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 773617951
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 62.9%

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 1
Current: £21,101 GBP|Low: £10,307 GBP|High: £26,572 GBP|Avg: £15,057 GBP
Aurelinne
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 5£10,307 GBP
Retailer 10£10,728 GBP
Retailer 9£11,073 GBP
Retailer 4£12,284 GBP
Retailer 2£13,556 GBP
Retailer 6£16,369 GBP
Retailer 3£18,046 GBP
Retailer 7£19,694 GBP
Retailer 8£20,320 GBP
Aurelinne£21,101 GBP

42 data points across 10 retailers

13 retailers£10,307 GBP to £18,046 GBP

A
Cheapest Retailer
-
£10,307 GBP
$13,810 USD
A
Retailer 2
-
£10,728 GBP
$14,374 USD
View
A
Retailer 3
-
£11,073 GBP
$14,836 USD
View
Final sale: no returns
A
Retailer 4
-
£12,284 GBP
View
A
Retailer 5
-
£13,098 GBP
$17,550 USD
View
A
Retailer 6
-
£13,098 GBP
$17,550 USD
View
B+
Retailer 7
-
£13,538 GBP
$18,140 USD
View
A
Retailer 8
-
£13,556 GBP
€17,298 EUR
View
B+
Retailer 9
-
£16,369 GBP
$21,933 USD
View
B
Retailer 10
-
£18,046 GBP
View
Retailer 11
-
£19,694 GBP
$26,388 USD
View
Price last confirmed 10 days ago
Retailer 12
-
£20,320 GBP
$27,226 USD
View
Price last confirmed 10 days ago
Most Expensive
Aurelinne
7aac21e0-3eb0-4766-9f63-ac646a3e278b · Oct 21
£21,101 GBP
$28,273 USD
View
Price last confirmed 11 days ago
12 more retailers have this diamond
Prices start from £10,307 GBPSave up to £7,739 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
£10,307 GBP