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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6491354443

Certificate GIA 6491354443

Diamond specifications and retailer prices

From $2,910 SGD
As of November 6, 2026
Save $3,617 SGD (55%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $6,818 SGD at NZ Jewellers · As of September 19, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6491354443. Listed at 16 retailers as of November 4, 2026, with a 124% 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

1.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6491354443
Dimensions7.37 × 7.32 × 4.50 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.37 mm7.32 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6491354443
Side View
Table 60.0%Crown 34.5°Girdle: ThickPavilion 40.8°Culet: NoneDepth 61.2%

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 6
Current: $4,057 SGD|Low: $2,811 SGD|High: $6,623 SGD|Avg: $4,097 SGD
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
November 6, 2026
Retailer 11$2,910 SGD
Retailer 2$3,505 SGD
Retailer 3$3,506 SGD
Retailer 10$3,532 SGD
Retailer 13$3,608 SGD
Retailer 12$3,847 SGD
Retailer 4$3,914 SGD
Retailer 6$4,020 SGD
Retailer 1$4,057 SGD
Retailer 5$4,096 SGD
Retailer 7$4,546 SGD
Retailer 8$4,777 SGD
Retailer 9$6,527 SGD

43 data points across 13 retailers

16 retailers$2,910 SGD to $6,527 SGD

A
Cheapest Retailer
-
$2,910 SGD
A
Retailer 2
-
$3,505 SGD
View
A
Retailer 3
-
$3,506 SGD
View
A
Retailer 4
-
$3,532 SGD
View
A
Retailer 5
-
$3,608 SGD
View
A
Retailer 6
-
$3,847 SGD
View
Retailer 7
-
$3,914 SGD
View
Price last confirmed 49 days ago
Retailer 8
-
$3,914 SGD
View
Price last confirmed 25 days ago
A
Retailer 9
-
$4,020 SGD
View
A
Retailer 10
-
$4,057 SGD
View
A
Retailer 11
-
$4,096 SGD
View
Retailer 12
-
$4,515 SGD
View
Price last confirmed 48 days ago
A
Retailer 13
-
$4,546 SGD
View
B+
Retailer 14
-
$4,777 SGD
View
B
Retailer 15
-
$6,527 SGD
View
Most Expensive
NZ Jewellers
665bc02b-f100-4dc7-8719-186e063fbfef · Sep 19
$6,818 SGD
$5,338 USD
View
Price last confirmed 48 days ago
15 more retailers have this diamond
Prices start from $2,910 SGDSave up to $3,617 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
1.51ct Round
$2,910 SGD