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Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

GD • J/SI2 • GIA 17427766

Certificate GIA 17427766

Diamond specifications and retailer prices

From $3,068 SGD
$2,400 USD
As of October 30, 2026
Save $2,968 SGD (49%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $7,164 SGD at NZ Jewellers · As of September 28, 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 SI2 clarity (slightly-included), with a standard cut grade and certified by GIA 17427766. Listed at 11 retailers as of October 29, 2026, with a 97% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
J
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
Crown angle33°
Pavilion angle40.2°
OriginNatural
Grading LabGIA
CertificateGIA 17427766
Dimensions6.91 × 6.94 × 4.04 mm
L/W Ratio1.00
Star length50%
Lower girdle85%
Key to symbols
Feather, Crystal, Knot
Top View
6.91 mm6.94 mm1.21 ctJ / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
CertificateGIA 17427766
Side View
Table 63.0%Crown 33°Girdle: STK-THKPavilion 40.2°Culet: NoneDepth 58.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $3,641 SGD|Low: $2,636 SGD|High: $6,075 SGD|Avg: $3,828 SGD|+3.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 31, 2026
Retailer 5$2,636 SGD
Retailer 2$3,307 SGD
Retailer 6$3,314 SGD
Retailer 1$3,641 SGD
Retailer 3$4,030 SGD
Retailer 4$6,036 SGD

39 data points across 6 retailers

11 retailers$3,068 SGD to $6,036 SGD

B+
Cheapest Retailer
-
$3,068 SGD
$2,400 USD
B
Retailer 2
-
$3,307 SGD
£2,037 GBP
View
B
Retailer 3
-
$3,314 SGD
A$3,988 AUD
View
Retailer 4
-
$3,427 SGD
$2,681 USD
View
Price last confirmed 33 days ago
Retailer 5
-
$3,559 SGD
$2,784 USD
View
Price last confirmed 32 days ago
B
Retailer 6
-
$3,641 SGD
£2,243 GBP
View
Retailer 7
-
$3,954 SGD
$3,093 USD
View
Price last confirmed 32 days ago
B
Retailer 8
-
$4,030 SGD
€3,002 EUR
View
C
Retailer 9
-
$4,667 SGD
€3,477 EUR
View
C
Retailer 10
-
$6,036 SGD
£3,718 GBP
View
Most Expensive
NZ Jewellers
0d78096f-79e7-4b7b-a025-93a553bf2cb8 · Sep 28
$7,164 SGD
$5,604 USD
View
Price last confirmed 34 days ago
10 more retailers have this diamond
Prices start from $3,068 SGDSave up to $2,968 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.

B+
1.21ct Round
$3,068 SGD