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2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1545386388

Certificate GIA 1545386388

Diamond specifications and retailer prices

From $18,858 SGD
$14,764 USD
As of November 5, 2026
2 retailers carry this diamond
Most expensive: $18,858 SGD at Blue Nile
View at Blue Nile

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 1545386388. Listed at 2 retailers as of November 5, 2026. 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
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1545386388
Dimensions8.64 × 8.60 × 5.42 mm
L/W Ratio1.00
Top View
8.64 mm8.60 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1545386388
Side View
Table 58.0%CrownGirdle: Sli. ThickPavilionCulet: NDepth 62.9%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: $18,858 SGD|Low: $12,818 SGD|High: $19,796 SGD|Avg: $16,131 SGD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 12, 2026
Retailer 11$12,818 SGD
Retailer 7$13,257 SGD
Retailer 9$14,446 SGD
Retailer 4$14,800 SGD
Retailer 8$15,288 SGD
Retailer 3$15,915 SGD
Retailer 6$16,143 SGD
Retailer 2$17,173 SGD
Retailer 5$17,919 SGD
Retailer 12$18,416 SGD
Blue Nile$18,858 SGD
Retailer 10$19,796 SGD

3 data points across 12 retailers

2 retailers

Retailer 1
-
$17,173 SGD
Price last confirmed 21 days ago
Most Expensive
B+
Blue Nile
29711795 · Nov 5
$18,858 SGD
$14,764 USD
View
1 more retailer has this diamond

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
$18,858 SGD