Cushion|Lab Grown|IGI

6.78ct F VVS1 Cushion Lab Grown Diamond

ID • F/VVS1 • IGI LG806611727

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

Certificate IGI LG806611727

Diamond specifications and retailer prices

From £1,726 GBP

$2,316 USD

As of November 1, 2026

Save £4,646 GBP (73%) vs most expensive(unlock to see where)

17 retailers carry this diamond

Most expensive: £11,281 GBP at Queensmith · As of October 9, 2026

View at Queensmith

About this 6.78ct lab-grown cushion diamond

This 6.78ct lab-grown cushion sits in the over five carat band, graded F colour (colourless) and VVS1 clarity (very-very-slightly-included), with a top-tier cut grade and certified by IGI LG806611727 or 806611727. Listed at 17 retailers as of November 1, 2026, with a 269% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

6.78

Carat

Colour

VVS1

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle35°

Pavilion angle39.1°

OriginLab Grown

Grading LabIGI

CertificateIGI LG806611727

Dimensions11.14 × 10.95 × 7.26 mm

L/W Ratio1.02

Girdle conditionFaceted

Cert comments

This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG806611727

Side View

Caratlytics Score

How it works →

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 1

Current: £11,281 GBP|Low: £1,726 GBP|High: £11,281 GBP|Avg: £4,981 GBP

Queensmith

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

Retailer 7

Retailer 8

Retailer 9

Retailer 10

Retailer 11

Retailer 12

Retailer 13

Retailer 14

Retailer 15

Retailer 16

November 3, 2026

Retailer 3£1,726 GBP

Retailer 2£2,459 GBP

Retailer 9£2,662 GBP

Retailer 11£2,797 GBP

Retailer 13£3,313 GBP

Retailer 5£3,407 GBP

Retailer 10£3,420 GBP

Retailer 6£4,474 GBP

Retailer 12£4,850 GBP

Retailer 4£4,862 GBP

Retailer 8£4,866 GBP

Retailer 14£5,365 GBP

Retailer 7£6,033 GBP

Retailer 16£6,311 GBP

Retailer 15£6,371 GBP

Queensmith£11,281 GBP

42 data points across 16 retailers

17 retailers£1,726 GBP to £6,371 GBP

Cheapest Retailer

£1,726 GBP

$2,316 USD

Final sale: no returns

Retailer 2

£2,459 GBP

View

B+

Retailer 3

£2,662 GBP

$3,572 USD

View

B+

Retailer 4

£2,797 GBP

$3,753 USD

View

B+

Retailer 5

£3,313 GBP

A$6,839 AUD

View

B+

Retailer 6

£3,407 GBP

View

B+

Retailer 7

£3,420 GBP

€4,371 EUR

View

Retailer 8

£4,474 GBP

$6,004 USD

View

Price last confirmed 7 days ago

B+

Retailer 9

£4,658 GBP

$6,251 USD

View

Retailer 10

£4,850 GBP

View

B+

Retailer 11

£4,862 GBP

$6,524 USD

View

Retailer 12

£4,866 GBP

$6,530 USD

View

Price last confirmed 15 days ago

Retailer 13

£5,365 GBP

$7,199 USD

View

Retailer 14

£6,033 GBP

SGD 10,941 SGD

View

Retailer 15

£6,311 GBP

$8,469 USD

View

Retailer 16

£6,371 GBP

$8,550 USD

View

Most Expensive

Queensmith

LG806611727 · Oct 9

£11,281 GBP

View

Price last confirmed 24 days ago

16 more retailers have this diamond

Prices start from £1,726 GBPSave up to £4,646 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.

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