Heart|Lab Grown|IGI

4.51ct D FL Heart Lab Grown Diamond

ID • D/FL • IGI LG816612944

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG816612944

Diamond specifications and retailer prices

From €5,994 EUR

$6,697 USD

As of October 31, 2026

Save €6,179 EUR (51%) vs most expensive(unlock to see where)

5 retailers carry this diamond

Most expensive: €12,173 EUR at Brilliant Earth · As of October 31, 2026

View at Brilliant Earth

About this 4.51ct lab-grown heart diamond

This 4.51ct lab-grown heart sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816612944 or 816612944. Listed at 5 retailers as of October 31, 2026, with prices from €5,994 to €12,173, a €6,179 spread on the same certified stone. Brilliant Earth lists it at €12,173. 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

4.51

Carat

Color

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle35.4°

Pavilion angle39.3°

OriginLab Grown

Grading LabIGI

CertificateIGI LG816612944

Dimensions11.42 × 10.17 × 6.59 mm

L/W Ratio1.12

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 LG816612944

Side View

Caratlytics Score

How it works →

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: Oct 31

Current: €12,173 EUR|Low: €4,872 EUR|High: €34,389 EUR|Avg: €12,251 EUR|-44.0%

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

October 30, 2026

Retailer 6€4,877 EUR

Retailer 12€5,250 EUR

Retailer 10€5,259 EUR

Retailer 13€5,319 EUR

Retailer 2€5,994 EUR

Retailer 4€7,749 EUR

Retailer 7€8,095 EUR

Retailer 11€9,505 EUR

Retailer 8€11,908 EUR

Brilliant Earth€12,173 EUR

Retailer 3€15,796 EUR

Retailer 5€25,788 EUR

Retailer 9€31,069 EUR

10 data points across 13 retailers

5 retailers€5,994 EUR to €12,173 EUR

Retailer 1

€4,877 EUR

£4,291 GBP

Price last confirmed 19 days ago

Retailer 2

€5,994 EUR

$6,697 USD

View

Retailer 3

€8,095 EUR

$9,044 USD

View

Price last confirmed 20 days ago

Retailer 4

€11,908 EUR

£10,475 GBP

View

Price last confirmed 20 days ago

Most Expensive

B+

Brilliant Earth

21730774Y · Oct 31

€12,173 EUR

$13,600 USD

View

4 more retailers have this diamond

Prices start from €5,994 EURSave up to €6,179 EUR

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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4.51ct Heart

€5,994 EUR