Round|Natural|GIA

2.51ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 6521132271

Certificate GIA 6521132271

Diamond specifications and retailer prices

From £17,061 GBP
$22,860 USD
As of November 1, 2026
Save £13,479 GBP (44%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £35,461 GBP at Cape Diamonds · As of October 17, 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6521132271. Listed at 21 retailers as of November 1, 2026, with a 79% 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6521132271
Dimensions8.65 × 8.58 × 5.40 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
8.65 mm8.58 mm2.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6521132271
Side View
Table 56.0%Crown 36.5°Girdle: ThickPavilion 40.6°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 1
Current: £35,461 GBP|Low: £17,021 GBP|High: £40,840 GBP|Avg: £22,489 GBP
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 5£17,021 GBP
Retailer 13£17,061 GBP
Retailer 3£17,981 GBP
Retailer 9£18,393 GBP
Retailer 12£18,740 GBP
Retailer 7£19,928 GBP
Retailer 10£20,020 GBP
Retailer 6£21,569 GBP
Retailer 11£21,606 GBP
Retailer 8£23,216 GBP
Retailer 4£25,252 GBP
Retailer 2£30,540 GBP
Cape Diamonds£35,461 GBP

33 data points across 13 retailers

21 retailers£17,061 GBP to £30,540 GBP

A
Cheapest Retailer
-
£17,061 GBP
$22,860 USD
A
Retailer 2
-
£17,981 GBP
$24,092 USD
View
B+
Retailer 3
-
£17,990 GBP
$24,104 USD
View
A
Retailer 4
-
£18,393 GBP
₹2,347,045 INR
View
B+
Retailer 5
-
£18,740 GBP
$25,110 USD
View
Final sale: no returns
B+
Retailer 6
-
£19,928 GBP
View
B+
Retailer 7
-
£20,020 GBP
$26,824 USD
View
Retailer 8
-
£20,020 GBP
$26,824 USD
View
Price last confirmed 18 days ago
Retailer 9
-
£20,020 GBP
$26,824 USD
View
Price last confirmed 32 days ago
Retailer 10
-
£20,370 GBP
$27,293 USD
View
Price last confirmed 34 days ago
Retailer 11
-
£20,532 GBP
$27,511 USD
View
Price last confirmed 33 days ago
B+
Retailer 12
-
£20,905 GBP
$28,010 USD
View
B+
Retailer 13
-
£20,905 GBP
$28,010 USD
View
Retailer 14
-
£21,185 GBP
$28,385 USD
View
Price last confirmed 34 days ago
B+
Retailer 15
-
£21,569 GBP
View
B+
Retailer 16
-
£21,606 GBP
$28,950 USD
View
Retailer 17
-
£21,999 GBP
$29,476 USD
View
Price last confirmed 33 days ago
B
Retailer 18
-
£23,216 GBP
€29,626 EUR
View
Retailer 19
-
£25,252 GBP
$33,835 USD
View
Price last confirmed 11 days ago
B
Retailer 20
-
£30,540 GBP
View
Most Expensive
Cape Diamonds
cert_6521132271 · Oct 17
£35,461 GBP
ZAR 767,586 ZAR
View
Price last confirmed 15 days ago
20 more retailers have this diamond
Prices start from £17,061 GBPSave up to £13,479 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
£17,061 GBP