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Round|Natural|IGI

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 670478896

Shape and cutting style on the report: Round brilliant

Certificate IGI 670478896

Diamond specifications and retailer prices

From $2,263 SGD
As of November 5, 2026
Save $2,113 SGD (48%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $6,185 SGD at NZ Jewellers · As of September 21, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670478896. Listed at 16 retailers as of November 4, 2026, with a 93% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 670478896
Dimensions6.86 × 6.91 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.86 mm6.91 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670478896
Side View
Table 58.0%Crown 34.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $5,429 SGD|Low: $2,263 SGD|High: $6,185 SGD|Avg: $3,157 SGD|-12.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 7$2,263 SGD
Retailer 8$2,398 SGD
Retailer 9$2,535 SGD
Retailer 10$2,535 SGD
Retailer 6$2,557 SGD
Retailer 2$2,735 SGD
Retailer 4$3,057 SGD
Retailer 3$3,395 SGD
Retailer 5$4,377 SGD
NZ Jewellers$5,429 SGD

29 data points across 10 retailers

16 retailers$2,263 SGD to $4,377 SGD

A
Cheapest Retailer
-
$2,263 SGD
A
Retailer 2
-
$2,398 SGD
View
Retailer 3
-
$2,535 SGD
View
Price last confirmed 56 days ago
Retailer 4
-
$2,535 SGD
View
Price last confirmed 44 days ago
Retailer 5
-
$2,535 SGD
View
Price last confirmed 15 days ago
A
Retailer 6
-
$2,557 SGD
View
Retailer 7
-
$2,597 SGD
View
Price last confirmed 21 days ago
A
Retailer 8
-
$2,735 SGD
View
Retailer 9
-
$2,926 SGD
View
Price last confirmed 60 days ago
Retailer 10
-
$2,926 SGD
View
Price last confirmed 45 days ago
B+
Retailer 11
-
$3,057 SGD
View
B+
Retailer 12
-
$3,395 SGD
View
B
Retailer 13
-
$4,377 SGD
View
Retailer 14
-
$5,429 SGD
View
Price last confirmed 17 days ago
Retailer 15
-
$6,185 SGD
View
Price last confirmed 57 days ago
Most Expensive
NZ Jewellers
4037a78b-fd2d-45af-aade-16b6d7d538be · Sep 21
$6,185 SGD
$4,826 USD
View
Price last confirmed 46 days ago
15 more retailers have this diamond
Prices start from $2,263 SGDSave up to $2,113 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
$2,263 SGD