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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 $84,130 NZD
As of November 4, 2026
Save $60,466 NZD (42%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $144,596 NZD 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 $84,130 to $144,596, a $60,466 spread on the same certified stone. MOH London lists it at $144,596. 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: $144,596 NZD|Low: $84,130 NZD|High: $146,731 NZD|Avg: $105,549 NZD|-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$84,130 NZD
Retailer 3$91,439 NZD
Retailer 5$96,701 NZD
Retailer 6$96,701 NZD
Retailer 8$100,570 NZD
Retailer 9$104,437 NZD
Retailer 4$111,907 NZD
Retailer 2$115,531 NZD
MOH London$144,596 NZD

42 data points across 9 retailers

12 retailers$84,130 NZD to $144,596 NZD

B+
Cheapest Retailer
-
$84,130 NZD
B
Retailer 2
-
$89,897 NZD
View
B+
Retailer 3
-
$91,439 NZD
View
Retailer 4
-
$92,834 NZD
View
Price last confirmed 8 days ago
Retailer 5
-
$93,607 NZD
View
Price last confirmed 9 days ago
B
Retailer 6
-
$96,701 NZD
View
B
Retailer 7
-
$96,701 NZD
View
B
Retailer 8
-
$100,570 NZD
View
B
Retailer 9
-
$104,437 NZD
View
B
Retailer 10
-
$111,907 NZD
View
B
Retailer 11
-
$115,531 NZD
View
Most Expensive
B
MOH London
57A3B7F92 · Nov 4
$144,596 NZD
£64,003 GBP
View
11 more retailers have this diamond
Prices start from $84,130 NZDSave up to $60,466 NZD

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
$84,130 NZD