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Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

ID • H/SI1 • GIA 6565025664

Certificate GIA 6565025664

Diamond specifications and retailer prices

From $3,700 SGD
HK$22,600 HKD
As of November 1, 2026
Save $11,299 SGD (75%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $14,999 SGD at William & Sons Jewelers · As of November 2, 2026
View at William & Sons Jewelers

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6565025664. Listed at 20 retailers as of November 1, 2026, with prices from $3,700 to $14,999, a $11,299 spread on the same certified stone. William & Sons Jewelers lists it at $14,999. 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
H
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle35.9°
OriginNatural
Grading LabGIA
CertificateGIA 6565025664
Dimensions6.77 × 6.44 × 4.39 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizeNone
Top View
6.77 mm6.44 mm1.51 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6565025664
Side View
Table 64.0%Crown 33.2°Girdle: MED-THKPavilion 35.9°Culet: NDepth 68.1%

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: $5,595 SGD|Low: $3,528 SGD|High: $18,865 SGD|Avg: $6,018 SGD|+13.0%
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
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
William & Sons Jewelers
November 2, 2026
Retailer 15$3,700 SGD
Retailer 3$3,805 SGD
Retailer 7$3,811 SGD
Retailer 13$3,898 SGD
Retailer 12$3,934 SGD
Retailer 17$4,003 SGD
Retailer 10$4,298 SGD
Retailer 16$4,734 SGD
Retailer 18$5,000 SGD
Retailer 19$5,000 SGD
Retailer 2$5,167 SGD
Retailer 8$5,230 SGD
Retailer 1$5,595 SGD
Retailer 5$5,694 SGD
Retailer 6$5,759 SGD
Retailer 14$5,793 SGD
Retailer 11$5,888 SGD
Retailer 9$8,243 SGD
Retailer 4$14,778 SGD
William & Sons Jewelers$14,999 SGD

26 data points across 20 retailers

20 retailers$3,700 SGD to $14,999 SGD

A
Cheapest Retailer
-
$3,700 SGD
HK$22,600 HKD
A
Retailer 2
-
$3,805 SGD
$2,975 USD
View
A
Retailer 3
-
$3,898 SGD
$3,048 USD
View
A
Retailer 4
-
$3,934 SGD
$3,076 USD
View
A
Retailer 5
-
$4,003 SGD
$3,130 USD
View
Retailer 6
-
$4,298 SGD
$3,361 USD
View
Price last confirmed 25 days ago
Retailer 7
-
$4,597 SGD
View
Price last confirmed 24 days ago
A
Retailer 8
-
$4,734 SGD
$3,702 USD
View
A
Retailer 9
-
$5,000 SGD
$3,910 USD
View
A
Retailer 10
-
$5,000 SGD
$3,910 USD
View
Retailer 11
-
$5,116 SGD
$4,000 USD
View
Price last confirmed 25 days ago
A
Retailer 12
-
$5,167 SGD
$4,040 USD
View
Retailer 13
-
$5,230 SGD
A$6,292 AUD
View
Price last confirmed 24 days ago
A
Retailer 14
-
$5,460 SGD
A$6,568 AUD
View
B+
Retailer 15
-
$5,595 SGD
£3,445 GBP
View
A
Retailer 16
-
$5,793 SGD
$4,530 USD
View
Retailer 17
-
$5,888 SGD
ZAR 74,372 ZAR
View
Price last confirmed 33 days ago
Retailer 18
-
$8,243 SGD
£5,075 GBP
View
Price last confirmed 25 days ago
Retailer 19
-
$14,778 SGD
$11,555 USD
View
Price last confirmed 9 days ago
Most Expensive
C
William & Sons Jewelers
cert_6565025664 · Nov 2
$14,999 SGD
$11,728 USD
View
Final sale: no returns
19 more retailers have this diamond
Prices start from $3,700 SGDSave up to $11,299 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 Cushion
$3,700 SGD