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Round|Natural|GIA

2.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1549103009

Certificate GIA 1549103009

Diamond specifications and retailer prices

From £18,565 GBP
$24,875 USD
As of October 31, 2026
Save £10,703 GBP (37%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £29,268 GBP at Cape Diamonds · As of October 27, 2026
View at Cape Diamonds

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 GIA 1549103009. Listed at 13 retailers as of October 27, 2026, with prices from £18,565 to £29,268, a £10,703 spread on the same certified stone. Cape Diamonds lists it at £29,268. 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
FluorescenceNone
Crown angle32.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1549103009
Dimensions8.94 × 8.88 × 5.21 mm
L/W Ratio1.01
Girdle conditionMedium
Key to symbols
Cloud, Feather, Crystal, Needle
Top View
8.94 mm8.88 mm2.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1549103009
Side View
Table 61.0%Crown 32.5°Girdle: MediumPavilion 41°Culet: NoneDepth 58.4%

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: Oct 31
Current: £29,268 GBP|Low: £18,363 GBP|High: £32,348 GBP|Avg: £22,921 GBP|+1.4%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 1, 2026
Retailer 11£18,363 GBP
Retailer 12£18,565 GBP
Retailer 2£19,734 GBP
Retailer 8£19,750 GBP
Retailer 4£20,099 GBP
Retailer 9£21,431 GBP
Retailer 5£21,547 GBP
Retailer 10£21,679 GBP
Retailer 7£22,975 GBP
Retailer 3£24,735 GBP
Retailer 6£24,853 GBP
Cape Diamonds£29,268 GBP
Retailer 13£32,305 GBP

36 data points across 13 retailers

13 retailers£18,565 GBP to £29,268 GBP

Retailer 1
-
£18,363 GBP
$24,605 USD
Price last confirmed 7 days ago
B+
Retailer 2
-
£18,565 GBP
$24,875 USD
View
B+
Retailer 3
-
£19,734 GBP
₹2,518,184 INR
View
B
Retailer 4
-
£19,750 GBP
$26,463 USD
View
B+
Retailer 5
-
£20,203 GBP
A$41,646 AUD
View
B
Retailer 6
-
£21,431 GBP
$28,715 USD
View
Retailer 7
-
£21,431 GBP
$28,715 USD
View
Price last confirmed 11 days ago
Retailer 8
-
£21,547 GBP
$28,870 USD
View
Price last confirmed 42 days ago
B
Retailer 9
-
£21,679 GBP
$29,048 USD
View
B
Retailer 10
-
£22,975 GBP
View
Retailer 11
-
£24,735 GBP
$33,142 USD
View
Price last confirmed 39 days ago
B
Retailer 12
-
£24,853 GBP
€31,714 EUR
View
Most Expensive
B
Cape Diamonds
cert_1549103009 · Oct 27
£29,268 GBP
ZAR 633,536 ZAR
View
12 more retailers have this diamond
Prices start from £18,565 GBPSave up to £10,703 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+
2.51ct Round
£18,565 GBP