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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 £3,803 GBP
As of November 5, 2026
Save £2,527 GBP (40%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £6,330 GBP 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 £3,803 to £6,330, a £2,527 spread on the same certified stone. MOH London lists it at £6,330. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £6,330 GBP|Low: £3,347 GBP|High: £6,423 GBP|Avg: £4,381 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7£3,405 GBP
Retailer 6£3,803 GBP
Retailer 4£3,852 GBP
Retailer 5£3,984 GBP
Retailer 2£4,483 GBP
Retailer 3£4,861 GBP
MOH London£6,330 GBP

43 data points across 7 retailers

6 retailers£3,803 GBP to £6,330 GBP

B+
Cheapest Retailer
-
£3,803 GBP
B+
Retailer 2
-
£3,852 GBP
View
Retailer 3
-
£3,984 GBP
View
Price last confirmed 8 days ago
B
Retailer 4
-
£4,483 GBP
View
B
Retailer 5
-
£4,861 GBP
View
Most Expensive
B
MOH London
1EB498011 · Nov 4
£6,330 GBP
View
5 more retailers have this diamond
Prices start from £3,803 GBPSave up to £2,527 GBP

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
£3,803 GBP