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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5516107542

Certificate GIA 5516107542

Diamond specifications and retailer prices

From $17,692 AUD
As of November 1, 2026
Save $13,420 AUD (43%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $31,112 AUD at MOH London · As of November 2, 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 5516107542. Listed at 13 retailers as of November 1, 2026, with prices from $17,692 to $31,112, a $13,420 spread on the same certified stone. MOH London lists it at $31,112. 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
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5516107542
Dimensions8.71 × 8.67 × 5.41 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
8.71 mm8.67 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5516107542
Side View
Table 56.0%Crown 35.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.3%

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: $31,112 AUD|Low: $17,692 AUD|High: $31,485 AUD|Avg: $24,754 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5$17,692 AUD
Retailer 3$20,918 AUD
Retailer 6$21,249 AUD
Retailer 4$24,936 AUD
Retailer 2$27,354 AUD
Retailer 7$28,221 AUD
MOH London$31,112 AUD

43 data points across 7 retailers

13 retailers$17,692 AUD to $31,112 AUD

A
Cheapest Retailer
-
$17,692 AUD
A
Retailer 2
-
$18,482 AUD
View
B+
Retailer 3
-
$19,563 AUD
View
Retailer 4
-
$19,920 AUD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$20,086 AUD
View
B+
Retailer 6
-
$20,918 AUD
View
B+
Retailer 7
-
$21,249 AUD
View
B+
Retailer 8
-
$21,580 AUD
View
B+
Retailer 9
-
$22,410 AUD
View
B
Retailer 10
-
$24,936 AUD
View
B
Retailer 11
-
$27,354 AUD
View
B
Retailer 12
-
$28,221 AUD
View
Most Expensive
B
MOH London
3665BC12E · Nov 2
$31,112 AUD
£17,149 GBP
View
12 more retailers have this diamond
Prices start from $17,692 AUDSave up to $13,420 AUD

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
$17,692 AUD