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Round|Natural|GIA

4.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1232890642

Certificate GIA 1232890642

Diamond specifications and retailer prices

From $67,558 AUD
As of November 4, 2026
Save $48,556 AUD (42%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $116,114 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 4.51ct natural round diamond

This 4.51ct natural round sits in the three to five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1232890642. Listed at 12 retailers as of November 4, 2026, with prices from $67,558 to $116,114, a $48,556 spread on the same certified stone. MOH London lists it at $116,114. 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

4.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 1232890642
Dimensions10.60 × 10.64 × 6.52 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle, Natural
Top View
10.60 mm10.64 mm4.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1232890642
Side View
Table 60.0%Crown 34°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 61.4%

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 4
Current: $116,114 AUD|Low: $67,558 AUD|High: $117,828 AUD|Avg: $84,758 AUD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7$67,558 AUD
Retailer 3$73,428 AUD
Retailer 5$77,653 AUD
Retailer 6$77,653 AUD
Retailer 8$80,760 AUD
Retailer 9$83,866 AUD
Retailer 4$89,864 AUD
Retailer 2$92,774 AUD
MOH London$116,114 AUD

42 data points across 9 retailers

12 retailers$67,558 AUD to $116,114 AUD

B+
Cheapest Retailer
-
$67,558 AUD
B
Retailer 2
-
$72,189 AUD
View
B+
Retailer 3
-
$73,428 AUD
View
Retailer 4
-
$74,548 AUD
View
Price last confirmed 8 days ago
Retailer 5
-
$75,169 AUD
View
Price last confirmed 9 days ago
B
Retailer 6
-
$77,653 AUD
View
B
Retailer 7
-
$77,653 AUD
View
B
Retailer 8
-
$80,760 AUD
View
B
Retailer 9
-
$83,866 AUD
View
B
Retailer 10
-
$89,864 AUD
View
B
Retailer 11
-
$92,774 AUD
View
Most Expensive
B
MOH London
57A3B7F92 · Nov 4
$116,114 AUD
£64,003 GBP
View
11 more retailers have this diamond
Prices start from $67,558 AUDSave up to $48,556 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.

B+
4.51ct Round
$67,558 AUD