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Cushion|Natural|GIA

1.80ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 1232955452

Certificate GIA 1232955452

Diamond specifications and retailer prices

From €2,178 EUR
As of November 6, 2026
Save €2,749 EUR (56%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: €4,928 EUR 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 1232955452. Listed at 8 retailers as of November 4, 2026, with prices from €2,178 to €4,928, a €2,749 spread on the same certified stone. MOH London lists it at €4,928. 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
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle35.99°
OriginNatural
Grading LabGIA
CertificateGIA 1232955452
Dimensions8.05 × 6.31 × 4.33 mm
L/W Ratio1.28
Key to symbols
Crystal, Feather, Cavity, Needle
Top View
8.05 mm6.31 mm1.80 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1232955452
Side View
Table 62.0%CrownGirdle: STK-VTKPavilion 35.99°Culet: NoneDepth 68.6%

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 6
Current: €4,928 EUR|Low: €2,178 EUR|High: €5,488 EUR|Avg: €3,354 EUR|-10.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5€2,178 EUR
Retailer 7€2,718 EUR
Retailer 2€2,866 EUR
Retailer 4€3,033 EUR
Retailer 6€3,192 EUR
Retailer 8€3,253 EUR
Retailer 3€3,524 EUR
MOH London€4,928 EUR

39 data points across 8 retailers

8 retailers€2,178 EUR to €4,928 EUR

A
Cheapest Retailer
-
€2,178 EUR
A
Retailer 2
-
€2,718 EUR
View
A
Retailer 3
-
€2,866 EUR
View
A
Retailer 4
-
€3,033 EUR
View
A
Retailer 5
-
€3,192 EUR
View
B+
Retailer 6
-
€3,253 EUR
View
A
Retailer 7
-
€3,524 EUR
View
Most Expensive
B
MOH London
CA5457909 · Nov 4
€4,928 EUR
£4,332 GBP
View
7 more retailers have this diamond
Prices start from €2,178 EURSave up to €2,749 EUR

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
1.80ct Cushion
€2,178 EUR