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Cushion|Lab Grown|IGI

1.00ct D SI1 Cushion Lab Grown Diamond

GD • D/SI1 • IGI LG689562161

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG689562161

Diamond specifications and retailer prices

From £140 GBP
As of November 6, 2026
Save £674 GBP (83%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £815 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1ct lab-grown cushion diamond

This 1ct lab-grown cushion sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG689562161 or 689562161. Listed at 13 retailers as of November 6, 2026, with prices from £140 to £815, a £674 spread on the same certified stone. Reve Diamonds lists it at £815. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.00
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle39°
OriginLab Grown
Grading LabIGI
CertificateIGI LG689562161
Dimensions6.60 × 5.40 × 3.63 mm
L/W Ratio1.22
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.60 mm5.40 mm1.00 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG689562161
Side View
Table 63.0%Crown 35.5°Girdle: STK-THKPavilion 39°Culet: NoneDepth 67.2%

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: £299 GBP|Low: £139 GBP|High: £815 GBP|Avg: £395 GBP|+10.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Reve Diamonds
November 6, 2026
Retailer 12£140 GBP
Retailer 9£241 GBP
Retailer 5£273 GBP
Retailer 11£279 GBP
Retailer 1£299 GBP
Retailer 3£302 GBP
Retailer 10£335 GBP
Retailer 8£385 GBP
Retailer 7£409 GBP
Retailer 4£441 GBP
Retailer 2£540 GBP
Retailer 6£725 GBP
Reve Diamonds£815 GBP

41 data points across 13 retailers

13 retailers£140 GBP to £815 GBP

A
Cheapest Retailer
-
£140 GBP
Final sale: no returns
B+
Retailer 2
-
£241 GBP
View
B+
Retailer 3
-
£273 GBP
View
B+
Retailer 4
-
£279 GBP
View
B+
Retailer 5
-
£299 GBP
View
B+
Retailer 6
-
£335 GBP
View
B
Retailer 7
-
£385 GBP
View
B
Retailer 8
-
£409 GBP
View
Retailer 9
-
£441 GBP
View
Price last confirmed 28 days ago
B
Retailer 10
-
£441 GBP
View
B
Retailer 11
-
£540 GBP
View
B
Retailer 12
-
£725 GBP
View
Most Expensive
C
Reve Diamonds
78CCF1F67 · Nov 6
£815 GBP
$1,091 USD
View
12 more retailers have this diamond
Prices start from £140 GBPSave up to £674 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
£140 GBP