Oval|Lab Grown|IGI

0.51ct D SI1 Oval Lab Grown Diamond

ID • D/SI1 • IGI LG831609122

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG831609122

Diamond specifications and retailer prices

From $99 USD
As of October 24, 2026
Save $291 USD (75%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $779 USD at MOH London · As of October 19, 2026
View at MOH London

About this 0.51ct lab-grown oval diamond

This 0.51ct lab-grown oval sits in the half to three-quarter carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG831609122 or 831609122. Listed at 14 retailers as of October 24, 2026, with a 294% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

0.51
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle30°
Pavilion angle38.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831609122
Dimensions6.86 × 4.42 × 2.62 mm
L/W Ratio1.55
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.86 mm4.42 mm0.51 ctD / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG831609122
Side View
Table 60.0%Crown 30°Girdle: STK-THKPavilion 38.8°Culet: NoneDepth 59.3%

Caratlytics Score

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A
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 24
Current: $779 USD|Low: $81 USD|High: $784 USD|Avg: $256 USD|+0.3%
MOH London
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
October 27, 2026
Retailer 5$85 USD
Retailer 4$95 USD
Retailer 11$99 USD
Retailer 7$112 USD
Retailer 8$128 USD
Retailer 13$175 USD
Retailer 9$180 USD
Retailer 14$202 USD
Retailer 12$224 USD
Retailer 16$226 USD
Retailer 3$270 USD
Retailer 6$305 USD
Retailer 10$339 USD
Retailer 15$339 USD
Retailer 2$390 USD
MOH London$779 USD

38 data points across 16 retailers

14 retailers$99 USD to $390 USD

Retailer 1
-
$85 USD
Price last confirmed 12 days ago
A
Retailer 2
-
$99 USD
View
Retailer 3
-
$112 USD
View
Price last confirmed 11 days ago
A
Retailer 4
-
$128 USD
HK$1,000 HKD
View
Retailer 5
-
$175 USD
View
Price last confirmed 12 days ago
A
Retailer 6
-
$180 USD
£142 GBP
View
B+
Retailer 7
-
$224 USD
View
Retailer 8
-
$226 USD
View
Price last confirmed 12 days ago
Retailer 9
-
$270 USD
£212 GBP
View
Price last confirmed 7 days ago
B+
Retailer 10
-
$305 USD
SGD 412 SGD
View
B+
Retailer 11
-
$339 USD
View
B+
Retailer 12
-
$339 USD
View
B+
Retailer 13
-
$390 USD
View
Most Expensive
MOH London
LG831609122 · Oct 19
$779 USD
£613 GBP
View
Price last confirmed 12 days ago
13 more retailers have this diamond
Prices start from $99 USDSave up to $291 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 Oval
$99 USD