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Round|Natural|GIA

2.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1558302144

Certificate GIA 1558302144

Diamond specifications and retailer prices

From £15,818 GBP
$21,195 USD
As of November 1, 2026
Save £7,152 GBP (31%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £22,971 GBP at Diamonds Direct · As of November 1, 2026
View at Diamonds Direct

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 1558302144. Listed at 13 retailers as of November 1, 2026, with prices from £15,818 to £22,971, a £7,152 spread on the same certified stone. Diamonds Direct lists it at £22,971. 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 angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1558302144
Dimensions8.60 × 8.64 × 5.41 mm
L/W Ratio1.00
Culet sizeNone
Top View
8.60 mm8.64 mm2.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558302144
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.7%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £22,971 GBP|Low: £15,298 GBP|High: £28,560 GBP|Avg: £19,117 GBP|-4.2%
Diamonds Direct
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 1, 2026
Retailer 2£15,818 GBP
Retailer 9£16,385 GBP
Retailer 14£16,454 GBP
Retailer 4£16,794 GBP
Retailer 5£17,316 GBP
Retailer 8£17,455 GBP
Retailer 10£17,960 GBP
Retailer 12£18,940 GBP
Retailer 15£19,188 GBP
Retailer 11£19,220 GBP
Retailer 6£19,460 GBP
Retailer 13£19,531 GBP
Retailer 16£19,823 GBP
Retailer 3£21,632 GBP
Diamonds Direct£22,971 GBP
Retailer 7£27,988 GBP

38 data points across 16 retailers

13 retailers£15,818 GBP to £22,971 GBP

B+
Cheapest Retailer
-
£15,818 GBP
$21,195 USD
B+
Retailer 2
-
£16,385 GBP
$21,954 USD
View
B+
Retailer 3
-
£16,454 GBP
SGD 29,793 SGD
View
Retailer 4
-
£17,455 GBP
$23,388 USD
View
Price last confirmed 27 days ago
B
Retailer 5
-
£17,960 GBP
$24,064 USD
View
B
Retailer 6
-
£18,940 GBP
$25,378 USD
View
B
Retailer 7
-
£19,188 GBP
$25,710 USD
View
B
Retailer 8
-
£19,220 GBP
$25,752 USD
View
B+
Retailer 9
-
£19,531 GBP
$26,170 USD
View
B
Retailer 10
-
£19,823 GBP
$26,560 USD
View
B
Retailer 11
-
£20,766 GBP
$27,824 USD
View
B
Retailer 12
-
£21,632 GBP
$28,984 USD
View
Most Expensive
B
Diamonds Direct
1136884 · Nov 1
£22,971 GBP
$30,778 USD
View
12 more retailers have this diamond
Prices start from £15,818 GBPSave up to £7,152 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
£15,818 GBP