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Round|Natural|GIA

4.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2231859024

Certificate GIA 2231859024

Diamond specifications and retailer prices

From $42,646 AUD
As of November 6, 2026
Save $14,902 AUD (26%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $83,672 AUD 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: $83,672 AUD|Low: $41,177 AUD|High: $84,229 AUD|Avg: $54,550 AUD|-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$41,177 AUD
Retailer 19$42,646 AUD
Retailer 20$43,318 AUD
Retailer 2$44,323 AUD
Retailer 22$45,066 AUD
Retailer 21$45,932 AUD
Retailer 7$46,733 AUD
Retailer 17$47,496 AUD
Retailer 11$48,516 AUD
Retailer 14$51,712 AUD
Retailer 13$52,632 AUD
Retailer 4$53,290 AUD
Retailer 3$55,447 AUD
Retailer 6$55,510 AUD
Retailer 9$55,510 AUD
Retailer 12$56,986 AUD
Retailer 16$57,549 AUD
Retailer 10$57,730 AUD
Retailer 8$59,951 AUD
Retailer 5$65,487 AUD
Retailer 18$67,048 AUD
MOH London$83,672 AUD

25 data points across 22 retailers

21 retailers$42,646 AUD to $57,549 AUD

A
Cheapest Retailer
-
$42,646 AUD
A
Retailer 2
-
$43,318 AUD
View
A
Retailer 3
-
$44,323 AUD
View
A
Retailer 4
-
$45,066 AUD
View
A
Retailer 5
-
$45,932 AUD
View
Retailer 6
-
$46,733 AUD
View
Price last confirmed 16 days ago
A
Retailer 7
-
$47,496 AUD
View
Retailer 8
-
$48,516 AUD
View
Price last confirmed 14 days ago
Retailer 9
-
$51,712 AUD
View
Price last confirmed 13 days ago
B+
Retailer 10
-
$52,632 AUD
View
Retailer 11
-
$53,290 AUD
View
Price last confirmed 13 days ago
Retailer 12
-
$55,510 AUD
View
Price last confirmed 14 days ago
Retailer 13
-
$55,510 AUD
View
Price last confirmed 15 days ago
Retailer 14
-
$56,986 AUD
View
Price last confirmed 23 days ago
B+
Retailer 15
-
$57,549 AUD
View
Retailer 16
-
$57,730 AUD
View
Price last confirmed 15 days ago
Retailer 17
-
$59,951 AUD
View
Price last confirmed 14 days ago
Retailer 18
-
$64,283 AUD
View
Price last confirmed 13 days ago
Retailer 19
-
$65,487 AUD
View
Price last confirmed 15 days ago
Retailer 20
-
$67,048 AUD
View
Price last confirmed 9 days ago
Most Expensive
MOH London
620BE549C · Oct 21
$83,672 AUD
£46,121 GBP
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from $42,646 AUDSave up to $14,902 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
4.21ct Round
$42,646 AUD