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Cushion|Natural|GIA

1.00ct D SI1 Cushion Natural Diamond

EX • D/SI1 • GIA 2564185089

Certificate GIA 2564185089

Diamond specifications and retailer prices

From £1,250 GBP
$1,675 USD
As of October 28, 2026
Save £308 GBP (20%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,558 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 1ct natural cushion diamond

This 1ct 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 2564185089. Listed at 6 retailers as of October 28, 2026, with prices from £1,250 to £1,558, a £308 spread on the same certified stone. Blue Nile lists it at £1,558. 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

1.00
Carat
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2564185089
Dimensions5.59 × 5.36 × 3.72 mm
L/W Ratio1.04
Culet sizeNone
Key to symbols
Crystal, Cloud, Needle
Top View
5.59 mm5.36 mm1.00 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2564185089
Side View
Table 61.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 69.4%

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: Oct 28
Current: £1,558 GBP|Low: £1,143 GBP|High: £1,640 GBP|Avg: £1,398 GBP|-5.0%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 4£1,250 GBP
Retailer 3£1,301 GBP
Retailer 5£1,301 GBP
Retailer 2£1,421 GBP
Retailer 6£1,491 GBP
Blue Nile£1,558 GBP

39 data points across 6 retailers

6 retailers£1,250 GBP to £1,558 GBP

A
Cheapest Retailer
-
£1,250 GBP
$1,675 USD
A
Retailer 2
-
£1,301 GBP
$1,743 USD
View
A
Retailer 3
-
£1,301 GBP
$1,743 USD
View
Final sale: no returns
A
Retailer 4
-
£1,421 GBP
View
A
Retailer 5
-
£1,491 GBP
SGD 2,700 SGD
View
Most Expensive
A
Blue Nile
30120227 · Oct 31
£1,558 GBP
$2,088 USD
View
5 more retailers have this diamond
Prices start from £1,250 GBPSave up to £308 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
1.00ct Cushion
£1,250 GBP