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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6525293492

Certificate GIA 6525293492

Diamond specifications and retailer prices

From $12,505 USD
As of November 1, 2026
Save $8,941 USD (42%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $21,446 USD at MOH London · As of November 4, 2026
View at MOH London

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6525293492. Listed at 15 retailers as of November 1, 2026, with prices from $12,505 to $21,446, a $8,941 spread on the same certified stone. MOH London lists it at $21,446. 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
K
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6525293492
Dimensions8.67 × 8.62 × 5.41 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
8.67 mm8.62 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 6525293492
Side View
Table 55.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $21,446 USD|Low: $12,505 USD|High: $21,763 USD|Avg: $16,140 USD|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 6$12,505 USD
Retailer 7$12,774 USD
Retailer 4$14,456 USD
Retailer 8$14,990 USD
Retailer 2$15,756 USD
Retailer 5$17,214 USD
Retailer 3$18,906 USD
MOH London$21,446 USD

36 data points across 8 retailers

15 retailers$12,505 USD to $21,446 USD

A
Cheapest Retailer
-
$12,505 USD
A
Retailer 2
-
$12,774 USD
View
B+
Retailer 3
-
$13,525 USD
View
Retailer 4
-
$13,769 USD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$14,456 USD
View
B+
Retailer 6
-
$14,687 USD
View
B+
Retailer 7
-
$14,916 USD
View
B+
Retailer 8
-
$14,990 USD
View
B+
Retailer 9
-
$15,053 USD
View
B+
Retailer 10
-
$15,490 USD
View
B+
Retailer 11
-
$15,756 USD
View
B
Retailer 12
-
$17,214 USD
View
B
Retailer 13
-
$18,906 USD
View
B
Retailer 14
-
$19,506 USD
View
Most Expensive
B
MOH London
C28A85AE2 · Nov 4
$21,446 USD
£16,887 GBP
View
14 more retailers have this diamond
Prices start from $12,505 USDSave up to $8,941 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.

A
2.51ct Round
$12,505 USD