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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6431629525

Certificate GIA 6431629525

Diamond specifications and retailer prices

From $3,603 SGD
As of November 1, 2026
Save $3,824 SGD (51%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $7,737 SGD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431629525. Listed at 23 retailers as of November 1, 2026, with a 106% 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

1.21
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6431629525
Dimensions6.84 × 6.80 × 4.23 mm
L/W Ratio1.01
Top View
6.84 mm6.80 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431629525
Side View
Table 56.0%Crown 35.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.1%

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 1
Current: $6,475 SGD|Low: $3,603 SGD|High: $7,668 SGD|Avg: $4,908 SGD|-2.9%
Retailer 1
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
November 3, 2026
Retailer 15$3,603 SGD
Retailer 13$3,653 SGD
Retailer 16$3,686 SGD
Retailer 7$3,792 SGD
Retailer 9$4,049 SGD
Retailer 4$4,211 SGD
Retailer 3$4,402 SGD
Retailer 6$4,441 SGD
Retailer 17$4,575 SGD
Retailer 18$4,575 SGD
Retailer 12$4,612 SGD
Retailer 5$4,680 SGD
Retailer 2$4,729 SGD
Retailer 11$4,921 SGD
Retailer 8$5,284 SGD
Retailer 1$6,475 SGD
Retailer 14$7,427 SGD
Retailer 10$7,668 SGD

22 data points across 18 retailers

23 retailers$3,603 SGD to $7,427 SGD

A
Cheapest Retailer
-
$3,603 SGD
A
Retailer 2
-
$3,653 SGD
View
A
Retailer 3
-
$3,686 SGD
View
Retailer 4
-
$3,792 SGD
View
Price last confirmed 18 days ago
B+
Retailer 5
-
$4,049 SGD
View
B+
Retailer 6
-
$4,211 SGD
View
B+
Retailer 7
-
$4,402 SGD
View
Retailer 8
-
$4,441 SGD
View
Price last confirmed 56 days ago
Retailer 9
-
$4,441 SGD
View
Price last confirmed 21 days ago
Retailer 10
-
$4,441 SGD
View
Price last confirmed 19 days ago
B+
Retailer 11
-
$4,575 SGD
View
B+
Retailer 12
-
$4,575 SGD
View
Retailer 13
-
$4,611 SGD
View
Price last confirmed 22 days ago
B+
Retailer 14
-
$4,612 SGD
View
B+
Retailer 15
-
$4,680 SGD
View
B
Retailer 16
-
$4,729 SGD
View
B
Retailer 17
-
$4,921 SGD
View
Retailer 18
-
$5,124 SGD
View
Price last confirmed 60 days ago
Retailer 19
-
$5,124 SGD
View
Price last confirmed 19 days ago
B
Retailer 20
-
$6,475 SGD
View
B
Retailer 21
-
$7,427 SGD
View
Retailer 22
-
$7,737 SGD
View
Price last confirmed 57 days ago
Most Expensive
NZ Jewellers
ed3d6f6b-3ec0-4861-8c13-5b12bee53f86 · Oct 17
$7,737 SGD
$6,037 USD
View
Price last confirmed 20 days ago
22 more retailers have this diamond
Prices start from $3,603 SGDSave up to $3,824 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
$3,603 SGD