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Cushion|Lab Grown|IGI

1.00ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG689561775

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG689561775

Diamond specifications and retailer prices

From £140 GBP
As of November 6, 2026
Save £674 GBP (83%) vs most expensive(unlock to see where)
14 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 top-tier cut grade and certified by IGI LG689561775 or 689561775. Listed at 14 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. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle43.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG689561775
Dimensions6.04 × 6.01 × 3.97 mm
L/W Ratio1.00
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
6.04 mm6.01 mm1.00 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG689561775
Side View
Table 62.0%Crown 36.6°Girdle: MED-THKPavilion 43.7°Culet: NoneDepth 66.1%

Caratlytics Score

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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: £299 GBP|Low: £139 GBP|High: £815 GBP|Avg: £380 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
Retailer 13
Reve Diamonds
November 6, 2026
Retailer 2£140 GBP
Retailer 13£155 GBP
Retailer 10£241 GBP
Retailer 6£273 GBP
Retailer 12£279 GBP
Retailer 1£299 GBP
Retailer 5£302 GBP
Retailer 11£335 GBP
Retailer 9£385 GBP
Retailer 7£409 GBP
Retailer 4£433 GBP
Retailer 3£540 GBP
Retailer 8£726 GBP
Reve Diamonds£815 GBP

45 data points across 14 retailers

14 retailers£140 GBP to £815 GBP

A
Cheapest Retailer
-
£140 GBP
Final sale: no returns
Retailer 2
-
£155 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£241 GBP
View
A
Retailer 4
-
£273 GBP
View
A
Retailer 5
-
£279 GBP
View
B+
Retailer 6
-
£299 GBP
View
Retailer 7
-
£302 GBP
View
Price last confirmed 24 days ago
B+
Retailer 8
-
£335 GBP
View
B+
Retailer 9
-
£385 GBP
View
B+
Retailer 10
-
£409 GBP
View
B+
Retailer 11
-
£433 GBP
View
B
Retailer 12
-
£540 GBP
View
B
Retailer 13
-
£726 GBP
View
Most Expensive
B
Reve Diamonds
C99BFAB20 · Nov 6
£815 GBP
$1,091 USD
View
13 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