Heart|Lab Grown|IGI

1.66ct D FL Heart Lab Grown Diamond

ID • D/FL • IGI LG825660136

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG825660136

Diamond specifications and retailer prices

From £525 GBP

$705 USD

As of November 2, 2026

Save £2,958 GBP (85%) vs most expensive(unlock to see where)

19 retailers carry this diamond

Most expensive: £3,483 GBP at With Clarity · As of November 2, 2026

View at With Clarity

About this 1.66ct lab-grown heart diamond

This 1.66ct lab-grown heart sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG825660136 or 825660136. Listed at 19 retailers as of November 2, 2026, with prices from £525 to £3,483, a £2,958 spread on the same certified stone. With Clarity lists it at £3,483. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66

Carat

Colour

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle35°

Pavilion angle41.3°

OriginLab Grown

Grading LabIGI

CertificateIGI LG825660136

Dimensions8.05 × 7.24 × 4.93 mm

L/W Ratio1.11

Girdle conditionFaceted

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 LG825660136

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 2

Current: £1,403 GBP|Low: £525 GBP|High: £3,957 GBP|Avg: £1,537 GBP|-8.5%

Retailer 1

Retailer 2

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Retailer 12

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Retailer 18

With Clarity

November 2, 2026

Retailer 11£525 GBP

Retailer 6£579 GBP

Retailer 3£618 GBP

Retailer 8£642 GBP

Retailer 9£683 GBP

Retailer 17£749 GBP

Retailer 7£800 GBP

Retailer 12£990 GBP

Retailer 5£996 GBP

Retailer 18£1,003 GBP

Retailer 16£1,135 GBP

Retailer 1£1,403 GBP

Retailer 4£1,736 GBP

Retailer 15£2,040 GBP

Retailer 2£2,129 GBP

Retailer 14£2,438 GBP

Retailer 10£2,448 GBP

Retailer 13£2,973 GBP

With Clarity£3,483 GBP

37 data points across 19 retailers

19 retailers£525 GBP to £3,483 GBP

Cheapest Retailer

£525 GBP

$705 USD

Retailer 2

£579 GBP

$777 USD

View

Retailer 3

£618 GBP

$829 USD

View

Retailer 4

£642 GBP

$861 USD

View

Price last confirmed 16 days ago

Retailer 5

£683 GBP

$917 USD

View

Final sale: no returns

Retailer 6

£749 GBP

$1,005 USD

View

Retailer 7

£800 GBP

$1,074 USD

View

B+

Retailer 8

£990 GBP

View

B+

Retailer 9

£996 GBP

$1,337 USD

View

B+

Retailer 10

£1,003 GBP

$1,346 USD

View

B+

Retailer 11

£1,135 GBP

ZAR 24,613 ZAR

View

B+

Retailer 12

£1,403 GBP

$1,883 USD

View

B+

Retailer 13

£1,736 GBP

$2,330 USD

View

B+

Retailer 14

£2,040 GBP

$2,737 USD

View

Retailer 15

£2,129 GBP

$2,857 USD

View

Retailer 16

£2,438 GBP

View

Retailer 17

£2,448 GBP

SGD 4,440 SGD

View

Retailer 18

£2,973 GBP

$3,990 USD

View

Most Expensive

With Clarity

825660136 · Nov 2

£3,483 GBP

$4,674 USD

View

18 more retailers have this diamond

Prices start from £525 GBPSave up to £2,958 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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