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Cushion|Natural|GIA

1.20ct K SI1 Cushion Natural Diamond

ID • K/SI1 • GIA 1555890599

Certificate GIA 1555890599

Diamond specifications and retailer prices

From £1,100 GBP
As of November 6, 2026
Save £1,480 GBP (57%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £2,580 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.2ct natural cushion diamond

This 1.2ct natural cushion sits in the classic one-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 1555890599. Listed at 15 retailers as of November 2, 2026, with prices from £1,100 to £2,580, a £1,480 spread on the same certified stone. MOH London lists it at £2,580. 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

1.20
Carat
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1555890599
Dimensions7.26 × 5.39 × 3.65 mm
L/W Ratio1.35
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Needle, Cloud
Top View
7.26 mm5.39 mm1.20 ctK / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1555890599
Side View
Table 66.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 67.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £2,580 GBP|Low: £1,100 GBP|High: £2,611 GBP|Avg: £1,663 GBP|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9£1,100 GBP
Retailer 2£1,155 GBP
Retailer 6£1,359 GBP
Retailer 3£1,428 GBP
Retailer 10£1,473 GBP
Retailer 5£1,534 GBP
Retailer 8£1,599 GBP
Retailer 7£1,797 GBP
Retailer 4£2,000 GBP
MOH London£2,580 GBP

26 data points across 10 retailers

15 retailers£1,100 GBP to £2,580 GBP

A
Cheapest Retailer
-
£1,100 GBP
A
Retailer 2
-
£1,155 GBP
View
B+
Retailer 3
-
£1,359 GBP
View
B+
Retailer 4
-
£1,378 GBP
View
B+
Retailer 5
-
£1,378 GBP
View
B+
Retailer 6
-
£1,428 GBP
View
Retailer 7
-
£1,473 GBP
View
Price last confirmed 9 days ago
B+
Retailer 8
-
£1,509 GBP
View
B+
Retailer 9
-
£1,534 GBP
View
B+
Retailer 10
-
£1,539 GBP
View
B+
Retailer 11
-
£1,576 GBP
View
B+
Retailer 12
-
£1,599 GBP
View
B+
Retailer 13
-
£1,797 GBP
View
B
Retailer 14
-
£2,000 GBP
View
Most Expensive
B
MOH London
4A1957514 · Nov 2
£2,580 GBP
View
14 more retailers have this diamond
Prices start from £1,100 GBPSave up to £1,480 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.

A
1.20ct Cushion
£1,100 GBP