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Cushion|Natural|GIA

1.80ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 6545639504

Certificate GIA 6545639504

Diamond specifications and retailer prices

From $9,182 NZD
As of November 5, 2026
Save $6,101 NZD (40%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $15,283 NZD at MOH London · As of November 4, 2026
View at MOH London

About this 1.8ct natural cushion diamond

This 1.8ct natural cushion 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 stated by the retailer rather than the lab and certified by GIA 6545639504. Listed at 6 retailers as of November 4, 2026, with prices from $9,182 to $15,283, a $6,101 spread on the same certified stone. MOH London lists it at $15,283. 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

1.80
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6545639504
Dimensions7.80 × 6.01 × 4.26 mm
L/W Ratio1.30
Top View
7.80 mm6.01 mm1.80 ctK / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6545639504
Side View
Table 59.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 70.8%

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 5
Current: $15,283 NZD|Low: $8,081 NZD|High: $15,507 NZD|Avg: $10,577 NZD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7$8,222 NZD
Retailer 6$9,182 NZD
Retailer 4$9,301 NZD
Retailer 5$9,620 NZD
Retailer 2$10,825 NZD
Retailer 3$11,738 NZD
MOH London$15,283 NZD

43 data points across 7 retailers

6 retailers$9,182 NZD to $15,283 NZD

B+
Cheapest Retailer
-
$9,182 NZD
B+
Retailer 2
-
$9,301 NZD
View
Retailer 3
-
$9,620 NZD
View
Price last confirmed 8 days ago
B
Retailer 4
-
$10,825 NZD
View
B
Retailer 5
-
$11,738 NZD
View
Most Expensive
B
MOH London
1EB498011 · Nov 4
$15,283 NZD
£6,671 GBP
View
5 more retailers have this diamond
Prices start from $9,182 NZDSave up to $6,101 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.

B+
1.80ct Cushion
$9,182 NZD