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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 $5,090 USD
As of November 5, 2026
Save $3,382 USD (40%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $8,472 USD 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 $5,090 to $8,472, a $3,382 spread on the same certified stone. MOH London lists it at $8,472. 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
Color
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $8,472 USD|Low: $4,480 USD|High: $8,597 USD|Avg: $5,864 USD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7$4,558 USD
Retailer 6$5,090 USD
Retailer 4$5,156 USD
Retailer 5$5,333 USD
Retailer 2$6,001 USD
Retailer 3$6,507 USD
MOH London$8,472 USD

43 data points across 7 retailers

6 retailers$5,090 USD to $8,472 USD

B+
Cheapest Retailer
-
$5,090 USD
B+
Retailer 2
-
$5,156 USD
View
Retailer 3
-
$5,333 USD
View
Price last confirmed 8 days ago
B
Retailer 4
-
$6,001 USD
View
B
Retailer 5
-
$6,507 USD
View
Most Expensive
B
MOH London
1EB498011 · Nov 4
$8,472 USD
£6,671 GBP
View
5 more retailers have this diamond
Prices start from $5,090 USDSave up to $3,382 USD

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
$5,090 USD