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Cushion|Lab Grown|GIA

1.29ct F SI1 Cushion Lab Grown Diamond

EX • F/SI1 • GIA 1515120078

Certificate GIA 1515120078

Diamond specifications and retailer prices

From £309 GBP
As of November 6, 2026
Save £1,170 GBP (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,478 GBP at MOH London · As of November 3, 2026
View at MOH London

About this 1.29ct lab-grown cushion diamond

This 1.29ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded F 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 1515120078. Listed at 10 retailers as of November 3, 2026, with prices from £309 to £1,478, a £1,170 spread on the same certified stone. MOH London lists it at £1,478. 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

1.29
Carat
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 1515120078
Dimensions7.20 × 5.59 × 3.90 mm
L/W Ratio1.29
Girdle conditionFaceted
Cert comments
This is a man-made diamond produced by CVD (Chemical Vapor Deposition) growth process and has evidence of post-growth treatments to change the color.
Key to symbols
Growth Remnant
Top View
7.20 mm5.59 mm1.29 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1515120078
Side View
Table 64.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 69.8%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: £1,478 GBP|Low: £309 GBP|High: £1,495 GBP|Avg: £676 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 6£309 GBP
Retailer 7£456 GBP
Retailer 8£468 GBP
Retailer 3£488 GBP
Retailer 9£511 GBP
Retailer 4£561 GBP
Retailer 2£578 GBP
Retailer 5£1,141 GBP
MOH London£1,478 GBP

45 data points across 9 retailers

10 retailers£309 GBP to £1,478 GBP

A
Cheapest Retailer
-
£309 GBP
Final sale: no returns
A
Retailer 2
-
£352 GBP
View
B+
Retailer 3
-
£456 GBP
View
B+
Retailer 4
-
£468 GBP
View
B+
Retailer 5
-
£488 GBP
View
B+
Retailer 6
-
£561 GBP
View
B+
Retailer 7
-
£578 GBP
View
B
Retailer 8
-
£1,141 GBP
View
B
Retailer 9
-
£1,331 GBP
View
Most Expensive
B
MOH London
1515120078 · Nov 3
£1,478 GBP
View
9 more retailers have this diamond
Prices start from £309 GBPSave up to £1,170 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
1.29ct Cushion
£309 GBP