CaratHunter
Plans
Marquise|Lab Grown|IGI

0.51ct I SI1 Marquise Lab Grown Diamond

VG • I/SI1 • IGI LG440010794

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG440010794

Diamond specifications and retailer prices

From $274 USD
As of November 2, 2026
Save $1,096 USD (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,370 USD at MOH London · As of October 29, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG440010794 or 440010794. Listed at 10 retailers as of October 29, 2026, with prices from $274 to $1,370, a $1,096 spread on the same certified stone. MOH London lists it at $1,370. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
I
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle30.7°
Pavilion angle42.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG440010794
Dimensions7.78 × 4.31 × 2.68 mm
L/W Ratio1.81
Girdle conditionFaceted
Culet sizePointed
Cert comments
undefined
Top View
7.78 mm4.31 mm0.51 ctI / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG440010794
Side View
Table 61.0%Crown 30.7°Girdle: THN-STKPavilion 42.6°Culet: NoneDepth 62.2%

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: Nov 2
Current: $1,370 USD|Low: $263 USD|High: $1,380 USD|Avg: $630 USD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 7$274 USD
Retailer 11$318 USD
Retailer 2$320 USD
Retailer 8$340 USD
Retailer 12$340 USD
Retailer 3$500 USD
Retailer 10$564 USD
Retailer 5$632 USD
Retailer 4$693 USD
Retailer 6$1,045 USD
Retailer 9$1,094 USD
MOH London$1,370 USD

20 data points across 12 retailers

10 retailers$274 USD to $1,370 USD

A
Cheapest Retailer
-
$274 USD
B+
Retailer 2
-
$318 USD
View
B+
Retailer 3
-
$320 USD
View
Retailer 4
-
$340 USD
View
Price last confirmed 7 days ago
B+
Retailer 5
-
$340 USD
View
B
Retailer 6
-
$564 USD
View
Retailer 7
-
$632 USD
€602 EUR
View
Price last confirmed 7 days ago
B
Retailer 8
-
$1,045 USD
View
B
Retailer 9
-
$1,094 USD
View
Most Expensive
B
MOH London
LG440010794 · Oct 29
$1,370 USD
£1,079 GBP
View
9 more retailers have this diamond
Prices start from $274 USDSave up to $1,096 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
$274 USD