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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6442187847

Certificate GIA 6442187847

Diamond specifications and retailer prices

From $5,259 SGD
As of November 4, 2026
Save $4,523 SGD (46%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $10,728 SGD at NZ Jewellers · As of September 28, 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 6442187847. Listed at 17 retailers as of November 4, 2026, with a 86% 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
FluorescenceNone
Crown angle32.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6442187847
Dimensions7.47 × 7.46 × 4.47 mm
L/W Ratio1.00
Star length45%
Lower girdle75%
Top View
7.47 mm7.46 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6442187847
Side View
Table 58.0%Crown 32.5°Girdle: Sli. ThickPavilion 40.8°Culet: NoneDepth 59.9%

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: Nov 4
Current: $6,024 SGD|Low: $5,370 SGD|High: $9,926 SGD|Avg: $6,668 SGD|+1.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7$5,370 SGD
Retailer 8$5,406 SGD
Retailer 5$5,435 SGD
Retailer 1$6,024 SGD
Retailer 9$6,111 SGD
Retailer 6$6,158 SGD
Retailer 2$6,914 SGD
Retailer 3$7,513 SGD
Retailer 4$9,782 SGD

43 data points across 9 retailers

17 retailers$5,259 SGD to $9,782 SGD

B+
Cheapest Retailer
-
$5,259 SGD
B+
Retailer 2
-
$5,370 SGD
View
B+
Retailer 3
-
$5,406 SGD
View
B+
Retailer 4
-
$5,435 SGD
View
B+
Retailer 5
-
$5,805 SGD
View
B+
Retailer 6
-
$6,024 SGD
View
B+
Retailer 7
-
$6,111 SGD
View
Retailer 8
-
$6,158 SGD
View
Price last confirmed 8 days ago
Retailer 9
-
$6,158 SGD
View
Price last confirmed 29 days ago
B+
Retailer 10
-
$6,158 SGD
View
Retailer 11
-
$6,158 SGD
View
Price last confirmed 38 days ago
B+
Retailer 12
-
$6,349 SGD
View
B
Retailer 13
-
$6,914 SGD
View
Retailer 14
-
$7,106 SGD
View
Price last confirmed 28 days ago
B
Retailer 15
-
$7,513 SGD
View
B
Retailer 16
-
$9,782 SGD
View
Most Expensive
NZ Jewellers
b42a1ff0-1883-493f-9f89-2359ae6447b2 · Sep 28
$10,728 SGD
$8,399 USD
View
Price last confirmed 39 days ago
16 more retailers have this diamond
Prices start from $5,259 SGDSave up to $4,523 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+
1.51ct Round
$5,259 SGD