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Cushion|Natural|GIA

1.20ct D SI1 Cushion Natural Diamond

EX • D/SI1 • GIA 1545912378

Certificate GIA 1545912378

Diamond specifications and retailer prices

From £2,228 GBP
As of November 6, 2026
Save £2,661 GBP (54%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,991 GBP at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.2ct natural cushion diamond

This 1.2ct natural cushion sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1545912378. Listed at 19 retailers as of November 2, 2026, with a 119% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1545912378
Dimensions7.28 × 5.45 × 3.69 mm
L/W Ratio1.34
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Needle, Pinpoint
Top View
7.28 mm5.45 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1545912378
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: £4,991 GBP|Low: £2,208 GBP|High: £5,095 GBP|Avg: £3,224 GBP|-2.0%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 15£2,228 GBP
Retailer 2£2,316 GBP
Retailer 6£2,654 GBP
Retailer 5£2,699 GBP
Retailer 13£2,707 GBP
Retailer 4£2,790 GBP
Retailer 10£2,810 GBP
Retailer 8£2,836 GBP
Retailer 11£2,944 GBP
Retailer 3£3,033 GBP
Retailer 7£3,121 GBP
Retailer 9£3,290 GBP
Retailer 12£3,568 GBP
Retailer 14£4,889 GBP
Queensmith£4,991 GBP

23 data points across 15 retailers

19 retailers£2,228 GBP to £4,889 GBP

A
Cheapest Retailer
-
£2,228 GBP
B+
Retailer 2
-
£2,316 GBP
View
B+
Retailer 3
-
£2,654 GBP
View
B+
Retailer 4
-
£2,699 GBP
View
Final sale: no returns
B+
Retailer 5
-
£2,707 GBP
View
B+
Retailer 6
-
£2,790 GBP
View
B+
Retailer 7
-
£2,810 GBP
View
B+
Retailer 8
-
£2,824 GBP
View
B+
Retailer 9
-
£2,836 GBP
View
B+
Retailer 10
-
£2,944 GBP
View
B+
Retailer 11
-
£3,015 GBP
View
Retailer 12
-
£3,028 GBP
View
Price last confirmed 22 days ago
B+
Retailer 13
-
£3,033 GBP
View
B+
Retailer 14
-
£3,121 GBP
View
B+
Retailer 15
-
£3,290 GBP
View
Retailer 16
-
£3,296 GBP
View
Price last confirmed 34 days ago
B
Retailer 17
-
£3,568 GBP
View
B
Retailer 18
-
£4,889 GBP
View
Most Expensive
Queensmith
1545912378 · Oct 28
£4,991 GBP
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from £2,228 GBPSave up to £2,661 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
£2,228 GBP