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Round|Natural|GIA

1.00ct J SI1 Round Natural Diamond

VG • J/SI1 • GIA 2554975138

Certificate GIA 2554975138

Diamond specifications and retailer prices

From $1,962 SGD
As of November 1, 2026
Save $2,675 SGD (58%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $5,533 SGD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by GIA 2554975138. Listed at 20 retailers as of November 1, 2026, with a 136% 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

1.00
Carat
J
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle33.5°
Pavilion angle39.8°
OriginNatural
Grading LabGIA
CertificateGIA 2554975138
Dimensions6.33 × 6.37 × 3.92 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
6.33 mm6.37 mm1.00 ctJ / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2554975138
Side View
Table 54.0%Crown 33.5°Girdle: STK-THKPavilion 39.8°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
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 1
Current: $5,533 SGD|Low: $1,880 SGD|High: $6,212 SGD|Avg: $2,905 SGD|+1.0%
NZ Jewellers
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
Retailer 19
Retailer 20
November 2, 2026
Retailer 19$1,962 SGD
Retailer 14$2,005 SGD
Retailer 16$2,325 SGD
Retailer 7$2,440 SGD
Retailer 5$2,443 SGD
Retailer 6$2,523 SGD
Retailer 4$2,528 SGD
Retailer 10$2,547 SGD
Retailer 3$2,549 SGD
Retailer 12$2,626 SGD
Retailer 18$2,647 SGD
Retailer 11$2,664 SGD
Retailer 13$2,887 SGD
Retailer 20$2,891 SGD
Retailer 8$2,938 SGD
Retailer 9$3,100 SGD
Retailer 15$3,228 SGD
Retailer 2$3,368 SGD
Retailer 17$4,637 SGD
NZ Jewellers$5,533 SGD

23 data points across 20 retailers

20 retailers$1,962 SGD to $4,637 SGD

A
Cheapest Retailer
-
$1,962 SGD
A
Retailer 2
-
$2,005 SGD
View
B+
Retailer 3
-
$2,325 SGD
View
Retailer 4
-
$2,440 SGD
View
Price last confirmed 6 days ago
B+
Retailer 5
-
$2,523 SGD
View
B+
Retailer 6
-
$2,528 SGD
View
Retailer 7
-
$2,547 SGD
View
Price last confirmed 8 days ago
B+
Retailer 8
-
$2,549 SGD
View
Retailer 9
-
$2,626 SGD
View
Price last confirmed 10 days ago
B+
Retailer 10
-
$2,647 SGD
View
Retailer 11
-
$2,664 SGD
View
Price last confirmed 8 days ago
B
Retailer 12
-
$2,887 SGD
View
B
Retailer 13
-
$2,891 SGD
View
Retailer 14
-
$2,938 SGD
View
Price last confirmed 10 days ago
Retailer 15
-
$3,100 SGD
View
Price last confirmed 11 days ago
B
Retailer 16
-
$3,228 SGD
View
Retailer 17
-
$3,246 SGD
View
Price last confirmed 37 days ago
B
Retailer 18
-
$3,368 SGD
View
B
Retailer 19
-
$4,637 SGD
View
Most Expensive
NZ Jewellers
a148374b-b900-4dbc-83f0-c2e03d05ae8b · Oct 30
$5,533 SGD
$4,332 USD
View
Price last confirmed 7 days ago
19 more retailers have this diamond
Prices start from $1,962 SGDSave up to $2,675 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
1.00ct Round
$1,962 SGD