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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 $3,658 SGD
As of November 6, 2026
Save $6,349 SGD (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $10,007 SGD 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 $3,658 to $10,007, a $6,349 spread on the same certified stone. Diamond Quarter lists it at $10,007. 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: $4,678 SGD|Low: $3,658 SGD|High: $8,519 SGD|Avg: $5,825 SGD|-1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10$3,658 SGD
Retailer 11$4,513 SGD
Retailer 4$4,602 SGD
Retailer 1$4,678 SGD
Retailer 5$4,892 SGD
Retailer 2$5,237 SGD
Retailer 8$5,622 SGD
Retailer 6$5,680 SGD
Retailer 7$5,967 SGD
Retailer 9$8,177 SGD
Retailer 3$8,519 SGD

36 data points across 11 retailers

24 retailers$3,658 SGD to $10,007 SGD

A
Cheapest Retailer
-
$3,658 SGD
B+
Retailer 2
-
$4,341 SGD
View
B+
Retailer 3
-
$4,411 SGD
View
B+
Retailer 4
-
$4,513 SGD
View
Final sale: no returns
B+
Retailer 5
-
$4,602 SGD
View
B+
Retailer 6
-
$4,629 SGD
View
Retailer 7
-
$4,638 SGD
View
Price last confirmed 117 days ago
B+
Retailer 8
-
$4,678 SGD
View
B+
Retailer 9
-
$4,678 SGD
View
Retailer 10
-
$4,889 SGD
View
Price last confirmed 39 days ago
B
Retailer 11
-
$4,889 SGD
View
Retailer 12
-
$4,889 SGD
View
Price last confirmed 12 days ago
B+
Retailer 13
-
$4,892 SGD
View
B+
Retailer 14
-
$5,076 SGD
View
B+
Retailer 15
-
$5,078 SGD
View
Retailer 16
-
$5,237 SGD
View
Price last confirmed 29 days ago
B+
Retailer 17
-
$5,622 SGD
View
Retailer 18
-
$5,642 SGD
View
Price last confirmed 39 days ago
B+
Retailer 19
-
$5,680 SGD
View
B
Retailer 20
-
$5,967 SGD
View
B
Retailer 21
-
$8,177 SGD
View
Retailer 22
-
$8,519 SGD
View
Price last confirmed 41 days ago
B
Retailer 23
-
$8,519 SGD
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
$10,007 SGD
£6,148 GBP
View
23 more retailers have this diamond
Prices start from $3,658 SGDSave up to $6,349 SGD

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
$3,658 SGD