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Cushion|Natural|GIA

1.80ct K SI1 Cushion Natural Diamond

EX • K/SI1 • GIA 2557837840

Certificate GIA 2557837840

Diamond specifications and retailer prices

From £3,428 GBP
A$7,058 AUD
As of November 6, 2026
1 retailer carries this diamond
Only listing: £3,428 GBP at GemTrove
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at GemTrove

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 2557837840. Listed at a single retailer as of November 6, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 2557837840
Dimensions8.47 × 6.24 × 4.22 mm
L/W Ratio1.36
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Cloud, Crystal, Needle, Indented Natural, Natural
Top View
8.47 mm6.24 mm1.80 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceStrong
CertificateGIA 2557837840
Side View
Table 64.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 67.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 6
Current: £3,428 GBP|Low: £2,678 GBP|High: £4,264 GBP|Avg: £3,318 GBP
GemTrove
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
September 9, 2026
Retailer 7£2,687 GBP
Retailer 4£2,864 GBP
Retailer 5£3,133 GBP
Retailer 8£3,390 GBP
Retailer 3£3,396 GBP
Retailer 2£3,426 GBP
GemTrove£3,428 GBP
Retailer 6£3,892 GBP
Retailer 9£4,264 GBP

28 data points across 9 retailers

1 retailer

B
GemTrove
GT-N-00943052-98 · Nov 6
£3,428 GBP
A$7,058 AUD
View

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
£3,428 GBP