Radiant|Lab Grown|IGI

0.51ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG818662699

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG818662699

Diamond specifications and retailer prices

From $138 USD
As of November 4, 2026
Save $856 USD (86%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $994 USD at Reve Diamonds · As of November 4, 2026
View at Reve Diamonds

About this 0.51ct lab-grown radiant diamond

This 0.51ct lab-grown radiant 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 LG818662699 or 818662699. Listed at 20 retailers as of November 4, 2026, with prices from $138 to $994, a $856 spread on the same certified stone. Reve Diamonds lists it at $994. 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 angle38.9°
Pavilion angle35.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818662699
Dimensions5.66 × 3.95 × 2.67 mm
L/W Ratio1.43
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
5.66 mm3.95 mm0.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818662699
Side View
Table 63.0%Crown 38.9°Girdle: ThickPavilion 35.1°Culet: NoneDepth 67.6%

Caratlytics Score

How it works →
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: Nov 4
Current: $287 USD|Low: $132 USD|High: $1,010 USD|Avg: $399 USD|-0.7%
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Retailer 19
Reve Diamonds
November 4, 2026
Retailer 16$138 USD
Retailer 9$154 USD
Retailer 2$160 USD
Retailer 17$171 USD
Retailer 19$171 USD
Retailer 10$240 USD
Retailer 1$287 USD
Retailer 14$304 USD
Retailer 13$309 USD
Retailer 11$335 USD
Retailer 6$337 USD
Retailer 5$360 USD
Retailer 12$434 USD
Retailer 7$471 USD
Retailer 4$520 USD
Retailer 18$548 USD
Retailer 3$579 USD
Retailer 8$604 USD
Retailer 15$801 USD
Reve Diamonds$994 USD

39 data points across 20 retailers

20 retailers$138 USD to $994 USD

A
Cheapest Retailer
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$138 USD
A
Retailer 2
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$154 USD
View
Final sale: no returns
A
Retailer 3
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$160 USD
View
Retailer 4
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$171 USD
View
Price last confirmed 10 days ago
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Retailer 5
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$171 USD
View
A
Retailer 6
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$240 USD
View
A
Retailer 7
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$287 USD
View
A
Retailer 8
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$304 USD
View
A
Retailer 9
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$309 USD
View
A
Retailer 10
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$335 USD
View
A
Retailer 11
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$337 USD
View
Retailer 12
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$360 USD
View
Price last confirmed 14 days ago
B+
Retailer 13
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$434 USD
View
B+
Retailer 14
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$471 USD
View
Retailer 15
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$520 USD
View
Price last confirmed 13 days ago
B+
Retailer 16
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$548 USD
View
B
Retailer 17
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$579 USD
View
B
Retailer 18
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$604 USD
View
B
Retailer 19
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$801 USD
View
Most Expensive
B
Reve Diamonds
B758134AA · Nov 4
$994 USD
View
19 more retailers have this diamond
Prices start from $138 USDSave up to $856 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 Radiant
$138 USD