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Cushion|Lab Grown|IGI

1.00ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG688502761

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG688502761

Diamond specifications and retailer prices

From £154 GBP
$207 USD
As of November 1, 2026
Save £730 GBP (83%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,394 GBP at Do Amore Diamonds · As of November 2, 2026
View at Do Amore Diamonds

About this 1ct lab-grown cushion diamond

This 1ct lab-grown cushion sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG688502761 or 688502761. Listed at 12 retailers as of November 1, 2026, with a 473% 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

1.00
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.5°
Pavilion angle37.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG688502761
Dimensions5.88 × 5.70 × 3.70 mm
L/W Ratio1.03
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
5.88 mm5.70 mm1.00 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG688502761
Side View
Table 63.0%Crown 37.5°Girdle: STK-THKPavilion 37.5°Culet: NoneDepth 64.9%

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 1
Current: £1,394 GBP|Low: £154 GBP|High: £1,394 GBP|Avg: £534 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7£154 GBP
Retailer 8£231 GBP
Retailer 2£245 GBP
Retailer 6£250 GBP
Retailer 3£348 GBP
Retailer 5£656 GBP
Retailer 4£884 GBP
Do Amore Diamonds£1,394 GBP

41 data points across 8 retailers

12 retailers£154 GBP to £884 GBP

A
Cheapest Retailer
-
£154 GBP
$207 USD
Final sale: no returns
A
Retailer 2
-
£178 GBP
$239 USD
View
A
Retailer 3
-
£231 GBP
$310 USD
View
A
Retailer 4
-
£245 GBP
View
A
Retailer 5
-
£250 GBP
$335 USD
View
B+
Retailer 6
-
£348 GBP
View
B
Retailer 7
-
£656 GBP
$880 USD
View
B
Retailer 8
-
£736 GBP
$988 USD
View
B
Retailer 9
-
£856 GBP
$1,148 USD
View
B
Retailer 10
-
£884 GBP
View
Retailer 11
-
£1,326 GBP
$1,780 USD
View
Price under review
Most Expensive
Do Amore Diamonds
23-688502761 · Nov 2
£1,394 GBP
$1,870 USD
View
Price under review
11 more retailers have this diamond
Prices start from £154 GBPSave up to £730 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
£154 GBP