Round|Natural|GIA

4.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2231859024

Certificate GIA 2231859024

Diamond specifications and retailer prices

From $29,854 USD
As of November 4, 2026
Save $10,432 USD (26%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $58,574 USD 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 4, 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
Color
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 4
Current: $58,574 USD|Low: $28,825 USD|High: $58,964 USD|Avg: $38,187 USD|-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$28,825 USD
Retailer 19$29,854 USD
Retailer 20$30,324 USD
Retailer 13$31,153 USD
Retailer 22$31,548 USD
Retailer 21$32,154 USD
Retailer 7$32,715 USD
Retailer 17$33,249 USD
Retailer 11$33,963 USD
Retailer 14$36,200 USD
Retailer 2$36,844 USD
Retailer 4$37,305 USD
Retailer 3$38,815 USD
Retailer 6$38,859 USD
Retailer 9$38,859 USD
Retailer 12$39,892 USD
Retailer 16$40,286 USD
Retailer 10$40,413 USD
Retailer 8$41,968 USD
Retailer 5$45,843 USD
Retailer 18$46,936 USD
MOH London$58,574 USD

25 data points across 22 retailers

21 retailers$29,854 USD to $40,286 USD

A
Cheapest Retailer
-
$29,854 USD
A
Retailer 2
-
$30,324 USD
View
A
Retailer 3
-
$31,153 USD
View
A
Retailer 4
-
$31,548 USD
View
A
Retailer 5
-
$32,154 USD
View
Retailer 6
-
$32,715 USD
View
Price last confirmed 16 days ago
A
Retailer 7
-
$33,249 USD
View
Retailer 8
-
$33,963 USD
View
Price last confirmed 14 days ago
Retailer 9
-
$36,200 USD
View
Price last confirmed 13 days ago
B+
Retailer 10
-
$36,844 USD
View
Retailer 11
-
$37,305 USD
View
Price last confirmed 13 days ago
Retailer 12
-
$38,859 USD
View
Price last confirmed 14 days ago
Retailer 13
-
$38,859 USD
View
Price last confirmed 15 days ago
Retailer 14
-
$39,892 USD
View
Price last confirmed 23 days ago
B+
Retailer 15
-
$40,286 USD
View
Retailer 16
-
$40,413 USD
View
Price last confirmed 15 days ago
Retailer 17
-
$41,968 USD
View
Price last confirmed 14 days ago
Retailer 18
-
$45,000 USD
View
Price last confirmed 13 days ago
Retailer 19
-
$45,843 USD
View
Price last confirmed 15 days ago
Retailer 20
-
$46,936 USD
View
Price last confirmed 9 days ago
Most Expensive
MOH London
620BE549C · Oct 21
$58,574 USD
£46,121 GBP
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from $29,854 USDSave up to $10,432 USD

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
$29,854 USD