Round|Lab Grown|IGI

1.57ct F IF Round Lab Grown Diamond

ID • F/IF • IGI LG685518428

Shape and cutting style on the report: Round brilliant

Certificate IGI LG685518428

Diamond specifications and retailer prices

From £863 GBP

A$1,778 AUD

As of November 2, 2026

7 retailers carry this diamond

Most expensive: £1,486 GBP at Rare Carat · As of September 13, 2026

View at Rare Carat

About this 1.57ct lab-grown round diamond

This 1.57ct lab-grown round sits in the one-and-a-half to two carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG685518428 or 685518428. Listed at 7 retailers as of November 2, 2026. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.57

Carat

Colour

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle35.3°

Pavilion angle40.8°

OriginLab Grown

Grading LabIGI

CertificateIGI LG685518428

Dimensions7.39 × 7.47 × 4.61 mm

L/W Ratio1.01

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

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG685518428

Side View

Caratlytics Score

How it works →

B+

Very Good

Strong quality and value balance

Unlock full score analysis

See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2

Current: £1,486 GBP|Low: £344 GBP|High: £2,732 GBP|Avg: £1,075 GBP

Rare Carat

Retailer 2

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October 3, 2026

Retailer 12£344 GBP

Retailer 3£381 GBP

Retailer 9£550 GBP

Retailer 15£552 GBP

Retailer 6£583 GBP

Retailer 13£662 GBP

Retailer 14£707 GBP

Retailer 2£863 GBP

Retailer 16£984 GBP

Retailer 8£1,353 GBP

Retailer 7£1,388 GBP

Retailer 4£1,463 GBP

Rare Carat£1,486 GBP

Retailer 10£1,546 GBP

Retailer 11£1,560 GBP

Retailer 5£2,732 GBP

7 data points across 16 retailers

7 retailers

Retailer 1

£307 GBP

$412 USD

Price last confirmed 44 days ago

Retailer 2

£376 GBP

$504 USD

View

Price last confirmed 41 days ago

B+

Retailer 3

£863 GBP

A$1,778 AUD

View

Retailer 4

£984 GBP

$1,318 USD

View

Price last confirmed 41 days ago

Retailer 5

£1,211 GBP

A$2,497 AUD

View

Price last confirmed 96 days ago

Retailer 6

£1,352 GBP

$1,812 USD

View

Price last confirmed 42 days ago

Most Expensive

Rare Carat

V665679LG · Sep 13

£1,486 GBP

$1,991 USD

View

Price last confirmed 50 days ago

6 more retailers have this diamond

Prices start from £863 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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B+

1.57ct Round

£863 GBP