Marquise|Lab Grown|IGI

0.51ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG800675315

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG800675315

Diamond specifications and retailer prices

From $320 USD
£252 GBP
As of October 31, 2026
Save $329 USD (51%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $867 USD at MOH London · As of October 21, 2026
View at MOH London

About this 0.51ct lab-grown marquise diamond

This 0.51ct lab-grown marquise sits in the half to three-quarter carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG800675315 or 800675315. Listed at 9 retailers as of October 31, 2026, with a 103% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Flawless clarity in sub-one-carat stones is rarely visible to the naked eye over VS1, so you are paying a meaningful premium for grade rather than appearance.

The 4Cs

0.51
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800675315
Dimensions7.99 × 4.22 × 2.67 mm
L/W Ratio1.89
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
Top View
7.99 mm4.22 mm0.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800675315
Side View
Table 57.0%Crown 34.5°Girdle: MediumPavilion 40.2°Culet: NoneDepth 63.3%

Caratlytics Score

How it works →
A
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: Oct 31
Current: $867 USD|Low: $305 USD|High: $874 USD|Avg: $497 USD|+0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 5$311 USD
Retailer 3$320 USD
Retailer 6$339 USD
Retailer 7$341 USD
Retailer 8$409 USD
Retailer 2$550 USD
Retailer 9$579 USD
Retailer 4$644 USD
Retailer 10$649 USD
MOH London$867 USD

42 data points across 10 retailers

9 retailers$320 USD to $649 USD

A
Cheapest Retailer
-
$320 USD
£252 GBP
A
Retailer 2
-
$339 USD
View
A
Retailer 3
-
$341 USD
View
A
Retailer 4
-
$409 USD
View
B+
Retailer 5
-
$550 USD
View
B+
Retailer 6
-
$591 USD
View
B+
Retailer 7
-
$644 USD
A$990 AUD
View
B+
Retailer 8
-
$649 USD
View
Most Expensive
MOH London
LG800675315 · Oct 21
$867 USD
£683 GBP
View
Price last confirmed 12 days ago
8 more retailers have this diamond
Prices start from $320 USDSave up to $329 USD

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.

A
0.51ct Marquise
$320 USD