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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 $5,141 NZD
HK$22,600 HKD
As of November 1, 2026
Save $15,703 NZD (75%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $20,844 NZD 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 $5,141 to $20,844, a $15,703 spread on the same certified stone. William & Sons Jewelers lists it at $20,844. 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: $7,775 NZD|Low: $4,904 NZD|High: $26,217 NZD|Avg: $8,282 NZD|+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 3, 2026
Retailer 15$5,141 NZD
Retailer 3$5,287 NZD
Retailer 7$5,296 NZD
Retailer 13$5,417 NZD
Retailer 12$5,467 NZD
Retailer 17$5,563 NZD
Retailer 10$5,974 NZD
Retailer 16$6,580 NZD
Retailer 18$6,949 NZD
Retailer 19$6,949 NZD
Retailer 2$7,180 NZD
Retailer 8$7,268 NZD
Retailer 1$7,775 NZD
Retailer 5$7,913 NZD
Retailer 6$8,004 NZD
Retailer 14$8,051 NZD
Retailer 11$8,182 NZD
Retailer 9$11,455 NZD
Retailer 4$20,537 NZD
William & Sons Jewelers$20,844 NZD

27 data points across 20 retailers

20 retailers$5,141 NZD to $20,844 NZD

A
Cheapest Retailer
-
$5,141 NZD
HK$22,600 HKD
A
Retailer 2
-
$5,287 NZD
$2,975 USD
View
A
Retailer 3
-
$5,417 NZD
$3,048 USD
View
A
Retailer 4
-
$5,467 NZD
$3,076 USD
View
A
Retailer 5
-
$5,563 NZD
$3,130 USD
View
Retailer 6
-
$5,974 NZD
$3,361 USD
View
Price last confirmed 26 days ago
Retailer 7
-
$6,388 NZD
SGD 4,857 SGD
View
Price last confirmed 25 days ago
A
Retailer 8
-
$6,580 NZD
$3,702 USD
View
A
Retailer 9
-
$6,949 NZD
$3,910 USD
View
A
Retailer 10
-
$6,949 NZD
$3,910 USD
View
Retailer 11
-
$7,109 NZD
$4,000 USD
View
Price last confirmed 25 days ago
A
Retailer 12
-
$7,180 NZD
$4,040 USD
View
Retailer 13
-
$7,268 NZD
A$6,292 AUD
View
Price last confirmed 25 days ago
A
Retailer 14
-
$7,588 NZD
A$6,568 AUD
View
B+
Retailer 15
-
$7,775 NZD
£3,445 GBP
View
A
Retailer 16
-
$8,051 NZD
$4,530 USD
View
Retailer 17
-
$8,182 NZD
ZAR 74,372 ZAR
View
Price last confirmed 33 days ago
Retailer 18
-
$11,455 NZD
£5,075 GBP
View
Price last confirmed 26 days ago
Retailer 19
-
$20,537 NZD
$11,555 USD
View
Price last confirmed 10 days ago
Most Expensive
C
William & Sons Jewelers
cert_6565025664 · Nov 2
$20,844 NZD
$11,728 USD
View
Final sale: no returns
19 more retailers have this diamond
Prices start from $5,141 NZDSave up to $15,703 NZD

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
$5,141 NZD