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Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2507471981

Certificate GIA 2507471981

Diamond specifications and retailer prices

From HK$22,368 HKD
As of November 6, 2026
Save HK$38,826 HKD (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: HK$61,194 HKD at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2507471981. Listed at 24 retailers as of November 5, 2026, with prices from HK$22,368 to HK$61,194, a HK$38,826 spread on the same certified stone. Diamond Quarter lists it at HK$61,194. 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

1.21
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2507471981
Dimensions6.77 × 6.74 × 4.23 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.77 mm6.74 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2507471981
Side View
Table 59.0%Crown 36°Girdle: THN-STKPavilion 41°Culet: NoneDepth 62.6%

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$30,096 HKD|Low: HK$22,368 HKD|High: HK$52,095 HKD|Avg: HK$35,581 HKD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 10HK$22,368 HKD
Retailer 11HK$27,595 HKD
Retailer 5HK$28,144 HKD
Retailer 4HK$28,607 HKD
Retailer 1HK$30,096 HKD
Retailer 2HK$32,024 HKD
Retailer 8HK$34,383 HKD
Retailer 6HK$34,735 HKD
Retailer 7HK$36,491 HKD
Retailer 9HK$50,003 HKD
Retailer 3HK$52,095 HKD

37 data points across 11 retailers

24 retailersHK$22,368 HKD to HK$61,194 HKD

A
Cheapest Retailer
-
HK$22,368 HKD
B+
Retailer 2
-
HK$26,545 HKD
View
B+
Retailer 3
-
HK$26,976 HKD
View
B+
Retailer 4
-
HK$27,595 HKD
View
Final sale: no returns
B+
Retailer 5
-
HK$28,144 HKD
View
B+
Retailer 6
-
HK$28,309 HKD
View
Retailer 7
-
HK$28,364 HKD
View
Price last confirmed 118 days ago
B+
Retailer 8
-
HK$28,607 HKD
View
B+
Retailer 9
-
HK$28,607 HKD
View
Retailer 10
-
HK$29,900 HKD
View
Price last confirmed 40 days ago
B
Retailer 11
-
HK$29,900 HKD
View
Retailer 12
-
HK$29,900 HKD
View
Price last confirmed 13 days ago
B+
Retailer 13
-
HK$30,096 HKD
View
B+
Retailer 14
-
HK$31,044 HKD
View
B+
Retailer 15
-
HK$31,052 HKD
View
Retailer 16
-
HK$32,024 HKD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
HK$34,383 HKD
View
Retailer 18
-
HK$34,500 HKD
View
Price last confirmed 40 days ago
B+
Retailer 19
-
HK$34,735 HKD
View
B
Retailer 20
-
HK$36,491 HKD
View
B
Retailer 21
-
HK$50,003 HKD
View
Retailer 22
-
HK$52,095 HKD
View
Price last confirmed 42 days ago
B
Retailer 23
-
HK$52,095 HKD
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
HK$61,194 HKD
£6,148 GBP
View
23 more retailers have this diamond
Prices start from HK$22,368 HKDSave up to HK$38,826 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
1.21ct Round
HK$22,368 HKD