Heart|Lab Grown|IGI

1.91ct D FL Heart Lab Grown Diamond

EX • D/FL • IGI LG831604009

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG831604009

Diamond specifications and retailer prices

From £727 GBP

$975 USD

As of November 2, 2026

Save £2,761 GBP (79%) vs most expensive(unlock to see where)

21 retailers carry this diamond

Most expensive: £3,487 GBP at Brilliant Earth · As of October 31, 2026

View at Brilliant Earth

About this 1.91ct lab-grown heart diamond

This 1.91ct 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 LG831604009 or 831604009. Listed at 21 retailers as of October 31, 2026, with prices from £727 to £3,487, a £2,761 spread on the same certified stone. Brilliant Earth lists it at £3,487. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.91

Carat

Colour

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle34°

Pavilion angle40°

OriginLab Grown

Grading LabIGI

CertificateIGI LG831604009

Dimensions7.60 × 8.63 × 5.02 mm

L/W Ratio1.14

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

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG831604009

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: £3,487 GBP|Low: £727 GBP|High: £4,598 GBP|Avg: £2,227 GBP|-24.0%

Brilliant Earth

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

Retailer 17

Retailer 18

Retailer 19

Retailer 20

November 2, 2026

Retailer 2£727 GBP

Retailer 6£814 GBP

Retailer 18£843 GBP

Retailer 13£953 GBP

Retailer 9£973 GBP

Retailer 20£1,008 GBP

Retailer 3£1,151 GBP

Retailer 16£1,222 GBP

Retailer 14£1,300 GBP

Retailer 5£1,321 GBP

Retailer 19£1,580 GBP

Retailer 12£1,916 GBP

Retailer 11£2,060 GBP

Retailer 4£2,507 GBP

Retailer 17£2,733 GBP

Retailer 7£2,826 GBP

Retailer 15£2,859 GBP

Retailer 10£2,936 GBP

Retailer 8£3,039 GBP

Brilliant Earth£3,487 GBP

30 data points across 20 retailers

21 retailers£727 GBP to £3,487 GBP

Cheapest Retailer

£727 GBP

$975 USD

Retailer 2

£814 GBP

$1,092 USD

View

Final sale: no returns

Retailer 3

£843 GBP

$1,131 USD

View

Retailer 4

£953 GBP

View

Retailer 5

£973 GBP

HK$10,200 HKD

View

Retailer 6

£1,008 GBP

$1,353 USD

View

Retailer 7

£1,121 GBP

$1,504 USD

View

Price last confirmed 20 days ago

B+

Retailer 8

£1,151 GBP

$1,545 USD

View

B+

Retailer 9

£1,222 GBP

$1,640 USD

View

B+

Retailer 10

£1,300 GBP

View

B+

Retailer 11

£1,321 GBP

$1,773 USD

View

B+

Retailer 12

£1,580 GBP

$2,120 USD

View

Retailer 13

£1,916 GBP

$2,571 USD

View

B+

Retailer 14

£2,060 GBP

ZAR 44,652 ZAR

View

Retailer 15

£2,507 GBP

$3,364 USD

View

Retailer 16

£2,733 GBP

$3,667 USD

View

Retailer 17

£2,826 GBP

SGD 5,124 SGD

View

Retailer 18

£2,859 GBP

View

Retailer 19

£2,936 GBP

$3,940 USD

View

Retailer 20

£3,039 GBP

$4,078 USD

View

Most Expensive

Brilliant Earth

21605244A · Oct 31

£3,487 GBP

$4,680 USD

View

20 more retailers have this diamond

Prices start from £727 GBPSave up to £2,761 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.

Similar diamonds

1.91ct Heart

£727 GBP