Round|Natural|GIA

4.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2231859024

Certificate GIA 2231859024

Diamond specifications and retailer prices

From $53,107 NZD
As of November 6, 2026
Save $18,557 NZD (26%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $104,197 NZD at MOH London · As of October 21, 2026
View at MOH London

About this 4.21ct natural round diamond

This 4.21ct 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 2231859024. Listed at 21 retailers as of November 5, 2026, with a 35% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

4.21
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2231859024
Dimensions10.31 × 10.24 × 6.42 mm
L/W Ratio1.01
Top View
10.31 mm10.24 mm4.21 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2231859024
Side View
Table 58.0%Crown 35.5°Girdle: Med. - Sli. ThickPavilion 41°Culet: NoneDepth 62.5%

Caratlytics Score

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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 6
Current: $104,197 NZD|Low: $51,277 NZD|High: $104,890 NZD|Avg: $67,931 NZD|-0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
Retailer 21
Retailer 22
November 6, 2026
Retailer 15$51,277 NZD
Retailer 19$53,107 NZD
Retailer 20$53,943 NZD
Retailer 2$55,196 NZD
Retailer 22$56,121 NZD
Retailer 21$57,199 NZD
Retailer 7$58,197 NZD
Retailer 17$59,147 NZD
Retailer 11$60,417 NZD
Retailer 14$64,396 NZD
Retailer 13$65,542 NZD
Retailer 4$66,362 NZD
Retailer 3$69,048 NZD
Retailer 6$69,126 NZD
Retailer 9$69,126 NZD
Retailer 12$70,964 NZD
Retailer 16$71,665 NZD
Retailer 10$71,891 NZD
Retailer 8$74,657 NZD
Retailer 5$81,550 NZD
Retailer 18$83,494 NZD
MOH London$104,197 NZD

25 data points across 22 retailers

21 retailers$53,107 NZD to $71,665 NZD

A
Cheapest Retailer
-
$53,107 NZD
A
Retailer 2
-
$53,943 NZD
View
A
Retailer 3
-
$55,196 NZD
View
A
Retailer 4
-
$56,121 NZD
View
A
Retailer 5
-
$57,199 NZD
View
Retailer 6
-
$58,197 NZD
View
Price last confirmed 16 days ago
A
Retailer 7
-
$59,147 NZD
View
Retailer 8
-
$60,417 NZD
View
Price last confirmed 14 days ago
Retailer 9
-
$64,396 NZD
View
Price last confirmed 13 days ago
B+
Retailer 10
-
$65,542 NZD
View
Retailer 11
-
$66,362 NZD
View
Price last confirmed 13 days ago
Retailer 12
-
$69,126 NZD
View
Price last confirmed 14 days ago
Retailer 13
-
$69,126 NZD
View
Price last confirmed 15 days ago
Retailer 14
-
$70,964 NZD
View
Price last confirmed 23 days ago
B+
Retailer 15
-
$71,665 NZD
View
Retailer 16
-
$71,891 NZD
View
Price last confirmed 15 days ago
Retailer 17
-
$74,657 NZD
View
Price last confirmed 14 days ago
Retailer 18
-
$80,051 NZD
View
Price last confirmed 13 days ago
Retailer 19
-
$81,550 NZD
View
Price last confirmed 15 days ago
Retailer 20
-
$83,494 NZD
View
Price last confirmed 9 days ago
Most Expensive
MOH London
620BE549C · Oct 21
$104,197 NZD
£46,121 GBP
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from $53,107 NZDSave up to $18,557 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.

A
4.21ct Round
$53,107 NZD