Round|Natural|GIA

4.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2231859024

Certificate GIA 2231859024

Diamond specifications and retailer prices

From HK$234,211 HKD
As of November 6, 2026
Save HK$81,841 HKD (26%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: HK$459,522 HKD 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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: HK$459,522 HKD|Low: HK$226,138 HKD|High: HK$462,581 HKD|Avg: HK$299,584 HKD|-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 15HK$226,138 HKD
Retailer 19HK$234,211 HKD
Retailer 20HK$237,898 HKD
Retailer 2HK$243,421 HKD
Retailer 22HK$247,500 HKD
Retailer 21HK$252,255 HKD
Retailer 7HK$256,656 HKD
Retailer 17HK$260,845 HKD
Retailer 11HK$266,447 HKD
Retailer 14HK$283,996 HKD
Retailer 13HK$289,049 HKD
Retailer 4HK$292,665 HKD
Retailer 3HK$304,511 HKD
Retailer 6HK$304,857 HKD
Retailer 9HK$304,857 HKD
Retailer 12HK$312,961 HKD
Retailer 16HK$316,052 HKD
Retailer 10HK$317,048 HKD
Retailer 8HK$329,247 HKD
Retailer 5HK$359,648 HKD
Retailer 18HK$368,222 HKD
MOH LondonHK$459,522 HKD

25 data points across 22 retailers

21 retailersHK$234,211 HKD to HK$316,052 HKD

A
Cheapest Retailer
-
HK$234,211 HKD
A
Retailer 2
-
HK$237,898 HKD
View
A
Retailer 3
-
HK$243,421 HKD
View
A
Retailer 4
-
HK$247,500 HKD
View
A
Retailer 5
-
HK$252,255 HKD
View
Retailer 6
-
HK$256,656 HKD
View
Price last confirmed 16 days ago
A
Retailer 7
-
HK$260,845 HKD
View
Retailer 8
-
HK$266,447 HKD
View
Price last confirmed 14 days ago
Retailer 9
-
HK$283,996 HKD
View
Price last confirmed 13 days ago
B+
Retailer 10
-
HK$289,049 HKD
View
Retailer 11
-
HK$292,665 HKD
View
Price last confirmed 13 days ago
Retailer 12
-
HK$304,857 HKD
View
Price last confirmed 14 days ago
Retailer 13
-
HK$304,857 HKD
View
Price last confirmed 15 days ago
Retailer 14
-
HK$312,961 HKD
View
Price last confirmed 23 days ago
B+
Retailer 15
-
HK$316,052 HKD
View
Retailer 16
-
HK$317,048 HKD
View
Price last confirmed 15 days ago
Retailer 17
-
HK$329,247 HKD
View
Price last confirmed 14 days ago
Retailer 18
-
HK$353,034 HKD
View
Price last confirmed 13 days ago
Retailer 19
-
HK$359,648 HKD
View
Price last confirmed 15 days ago
Retailer 20
-
HK$368,222 HKD
View
Price last confirmed 9 days ago
Most Expensive
MOH London
620BE549C · Oct 21
HK$459,522 HKD
£46,121 GBP
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from HK$234,211 HKDSave up to HK$81,841 HKD

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
HK$234,211 HKD