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Cushion|Natural|GIA

1.51ct H SI1 Cushion Natural Diamond

EX • H/SI1 • GIA 2225656240

Certificate GIA 2225656240

Diamond specifications and retailer prices

From $10,020 AUD
$7,022 USD
As of November 2, 2026
Save $8,810 AUD (47%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $18,830 AUD at MOH London · As of November 1, 2026
View at MOH London

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 2225656240. Listed at 24 retailers as of November 1, 2026, with prices from $10,020 to $18,830, a $8,810 spread on the same certified stone. MOH London lists it at $18,830. 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
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.57°
Pavilion angle40.44°
OriginNatural
Grading LabGIA
CertificateGIA 2225656240
Dimensions6.79 × 6.63 × 4.44 mm
L/W Ratio1.02
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
6.79 mm6.63 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2225656240
Side View
Table 68.0%Crown 35.57°Girdle: THK-VTKPavilion 40.44°Culet: NoneDepth 67.0%

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 2
Current: $18,830 AUD|Low: $9,847 AUD|High: $19,057 AUD|Avg: $12,921 AUD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 3$10,020 AUD
Retailer 7$10,081 AUD
Retailer 9$10,579 AUD
Retailer 10$11,298 AUD
Retailer 11$11,300 AUD
Retailer 8$11,392 AUD
Retailer 4$12,612 AUD
Retailer 6$12,740 AUD
Retailer 2$14,759 AUD
Retailer 5$16,599 AUD
MOH London$18,830 AUD

43 data points across 11 retailers

24 retailers$10,020 AUD to $18,830 AUD

B+
Cheapest Retailer
-
$10,020 AUD
$7,022 USD
B+
Retailer 2
-
$10,081 AUD
$7,065 USD
View
B
Retailer 3
-
$10,508 AUD
$7,364 USD
View
B
Retailer 4
-
$10,547 AUD
View
B
Retailer 5
-
$10,579 AUD
$7,414 USD
View
B
Retailer 6
-
$10,875 AUD
$7,621 USD
View
B
Retailer 7
-
$11,251 AUD
$7,885 USD
View
B
Retailer 8
-
$11,298 AUD
$7,918 USD
View
Final sale: no returns
B
Retailer 9
-
$11,300 AUD
$7,919 USD
View
B
Retailer 10
-
$11,392 AUD
$7,984 USD
View
B
Retailer 11
-
$12,040 AUD
$8,438 USD
View
B
Retailer 12
-
$12,144 AUD
CA$11,820 CAD
View
B
Retailer 13
-
$12,408 AUD
View
B
Retailer 14
-
$12,437 AUD
$8,716 USD
View
B
Retailer 15
-
$12,612 AUD
£6,959 GBP
View
Retailer 16
-
$12,740 AUD
View
Price last confirmed 10 days ago
B
Retailer 17
-
$13,227 AUD
$9,270 USD
View
B
Retailer 18
-
$13,227 AUD
$9,270 USD
View
B
Retailer 19
-
$13,514 AUD
$9,471 USD
View
B
Retailer 20
-
$13,670 AUD
$9,580 USD
View
B
Retailer 21
-
$14,759 AUD
€9,851 EUR
View
Retailer 22
-
$14,875 AUD
$10,425 USD
View
Price last confirmed 10 days ago
B
Retailer 23
-
$16,599 AUD
ZAR 187,930 ZAR
View
Most Expensive
B
MOH London
2FED25E2D · Nov 1
$18,830 AUD
£10,391 GBP
View
23 more retailers have this diamond
Prices start from $10,020 AUDSave up to $8,810 AUD

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 Cushion
$10,020 AUD