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Marquise|Natural|GIA

2.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 2557437360

Certificate GIA 2557437360

Diamond specifications and retailer prices

From $22,563 USD
As of November 4, 2026
Save $16,037 USD (42%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $38,600 USD at MOH London · As of November 4, 2026
View at MOH London

About this 2.51ct natural marquise diamond

This 2.51ct natural marquise sits in the two to three carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2557437360. Listed at 22 retailers as of November 4, 2026, with prices from $22,563 to $38,600, a $16,037 spread on the same certified stone. MOH London lists it at $38,600. 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
I
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle38.37°
Pavilion angle41.81°
OriginNatural
Grading LabGIA
CertificateGIA 2557437360
Dimensions13.17 × 7.01 × 4.60 mm
L/W Ratio1.88
Girdle conditionVery Thick
Culet sizeNone
Key to symbols
Feather, Knot, Cloud, Crystal, Cavity, Needle, Indented Natural
Top View
13.17 mm7.01 mm2.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2557437360
Side View
Table 60.0%Crown 38.37°GirdlePavilion 41.81°Culet: NoneDepth 65.6%

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 4
Current: $38,600 USD|Low: $22,563 USD|High: $39,169 USD|Avg: $27,970 USD|-1.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9$22,563 USD
Retailer 8$23,749 USD
Retailer 10$24,135 USD
Retailer 7$24,782 USD
Retailer 5$24,944 USD
Retailer 3$24,982 USD
Retailer 11$24,988 USD
Retailer 2$28,359 USD
Retailer 6$29,943 USD
Retailer 4$34,030 USD
MOH London$38,600 USD

39 data points across 11 retailers

22 retailers$22,563 USD to $38,600 USD

B+
Cheapest Retailer
-
$22,563 USD
B+
Retailer 2
-
$23,749 USD
View
Final sale: no returns
B+
Retailer 3
-
$24,135 USD
View
Retailer 4
-
$24,782 USD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$24,944 USD
View
Retailer 6
-
$24,982 USD
View
Price last confirmed 33 days ago
B+
Retailer 7
-
$24,988 USD
View
Retailer 8
-
$26,021 USD
View
Price last confirmed 36 days ago
B+
Retailer 9
-
$26,021 USD
View
B+
Retailer 10
-
$26,488 USD
View
Retailer 11
-
$26,847 USD
View
Price last confirmed 29 days ago
Retailer 12
-
$26,847 USD
View
Price last confirmed 15 days ago
B
Retailer 13
-
$27,597 USD
View
B
Retailer 14
-
$27,880 USD
View
Retailer 15
-
$27,880 USD
View
Price last confirmed 28 days ago
Retailer 16
-
$27,880 USD
View
Price last confirmed 16 days ago
B
Retailer 17
-
$28,359 USD
View
B
Retailer 18
-
$29,943 USD
View
B
Retailer 19
-
$34,030 USD
View
Retailer 20
-
$35,108 USD
View
Price last confirmed 16 days ago
Retailer 21
-
$35,108 USD
View
Price last confirmed 38 days ago
Most Expensive
B
MOH London
6C219CCA7 · Nov 4
$38,600 USD
£30,394 GBP
View
21 more retailers have this diamond
Prices start from $22,563 USDSave up to $16,037 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 Marquise
$22,563 USD