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Round|Natural|GIA

5.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2135168818

Certificate GIA 2135168818

Diamond specifications and retailer prices

From HK$444,360 HKD
As of November 6, 2026
Save HK$276,134 HKD (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: HK$720,494 HKD at MOH London · As of November 4, 2026
View at MOH London

About this 5.21ct natural round diamond

This 5.21ct natural round sits in the over five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2135168818. Listed at 9 retailers as of November 4, 2026, with prices from HK$444,360 to HK$720,494, a HK$276,134 spread on the same certified stone. MOH London lists it at HK$720,494. 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

5.21
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2135168818
Dimensions11.05 × 11.08 × 6.86 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Top View
11.05 mm11.08 mm5.21 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2135168818
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.0%

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$720,494 HKD|Low: HK$444,360 HKD|High: HK$731,135 HKD|Avg: HK$520,398 HKD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8HK$444,360 HKD
Retailer 4HK$453,202 HKD
Retailer 2HK$463,055 HKD
Retailer 5HK$490,976 HKD
Retailer 6HK$490,976 HKD
Retailer 7HK$519,297 HKD
Retailer 3HK$544,543 HKD
MOH LondonHK$720,494 HKD

36 data points across 8 retailers

9 retailersHK$444,360 HKD to HK$720,494 HKD

A
Cheapest Retailer
-
HK$444,360 HKD
A
Retailer 2
-
HK$453,202 HKD
View
A
Retailer 3
-
HK$463,055 HKD
View
Retailer 4
-
HK$481,844 HKD
View
Price last confirmed 48 days ago
B+
Retailer 5
-
HK$490,976 HKD
View
B+
Retailer 6
-
HK$490,976 HKD
View
B+
Retailer 7
-
HK$519,297 HKD
View
B+
Retailer 8
-
HK$544,543 HKD
View
Most Expensive
B
MOH London
AAE49B0FC · Nov 4
HK$720,494 HKD
£72,314 GBP
View
8 more retailers have this diamond
Prices start from HK$444,360 HKDSave up to HK$276,134 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
5.21ct Round
HK$444,360 HKD