Round|Natural|GIA

2.51ct F SI1 Round Natural Diamond

EX • F/SI1

Diamond specifications and retailer prices

From $25,362 USD
As of November 2, 2026
Save $9,104 USD (26%) vs most expensive(unlock to see where)
25 retailers carry this diamond
Most expensive: $34,466 USD at The Diamond Guys · As of October 23, 2026
View at The Diamond Guys

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 25 retailers as of November 2, 2026, with a 36% 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
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
Dimensions8.59 × 8.62 × 5.45 mm
L/W Ratio1.00
Top View
8.59 mm8.62 mm2.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA
Side View
Table 56.0%CrownGirdle: MediumPavilionCulet: NoneDepth 63.4%

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: Nov 2
Current: $31,695 USD|Low: $25,125 USD|High: $34,466 USD|Avg: $30,390 USD|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
The Diamond Guys
November 2, 2026
Retailer 2$25,362 USD
Retailer 6$27,794 USD
Retailer 8$28,738 USD
Retailer 10$29,256 USD
Retailer 4$29,935 USD
Retailer 9$30,175 USD
Retailer 7$31,133 USD
Retailer 1$31,695 USD
Retailer 3$32,089 USD
Retailer 5$32,330 USD
The Diamond Guys$34,466 USD

40 data points across 11 retailers

25 retailers$25,362 USD to $34,466 USD

B+
Cheapest Retailer
-
$25,362 USD
B+
Retailer 2
-
$27,794 USD
CA$38,602 CAD
View
Retailer 3
-
$28,738 USD
View
Price last confirmed 21 days ago
Retailer 4
-
$28,738 USD
View
Price last confirmed 17 days ago
B+
Retailer 5
-
$28,738 USD
View
B
Retailer 6
-
$29,256 USD
View
B
Retailer 7
-
$29,935 USD
View
Retailer 8
-
$29,935 USD
View
Price last confirmed 22 days ago
Retailer 9
-
$29,935 USD
View
Price last confirmed 30 days ago
Retailer 10
-
$29,935 USD
View
Price last confirmed 24 days ago
Retailer 11
-
$29,935 USD
View
Price last confirmed 13 days ago
Retailer 12
-
$30,175 USD
View
Price last confirmed 11 days ago
B
Retailer 13
-
$30,175 USD
View
B
Retailer 14
-
$31,133 USD
View
Retailer 15
-
$31,133 USD
View
Price last confirmed 23 days ago
Retailer 16
-
$31,133 USD
View
Price last confirmed 11 days ago
B+
Retailer 17
-
$31,695 USD
£24,957 GBP
View
B
Retailer 18
-
$32,089 USD
View
Retailer 19
-
$32,330 USD
View
Price last confirmed 31 days ago
B
Retailer 20
-
$32,330 USD
View
Retailer 21
-
$32,330 USD
View
Price last confirmed 21 days ago
Retailer 22
-
$32,330 USD
View
Price last confirmed 12 days ago
Retailer 23
-
$32,330 USD
View
Price last confirmed 24 days ago
B
Retailer 24
-
$34,466 USD
View
Most Expensive
The Diamond Guys
1992909477 · Oct 23
$34,466 USD
View
Price last confirmed 10 days ago
24 more retailers have this diamond
Prices start from $25,362 USDSave up to $9,104 USD

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
$25,362 USD