Radiant|Lab Grown|IGI

5.28ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG780661346

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

Certificate IGI LG780661346

Diamond specifications and retailer prices

From $8,686 USD
As of October 27, 2026
Save $20,464 USD (70%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $29,150 USD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 5.28ct lab-grown radiant diamond

This 5.28ct lab-grown radiant sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780661346 or 780661346. Listed at 15 retailers as of October 27, 2026, with prices from $8,686 to $29,150, a $20,464 spread on the same certified stone. Brilliant Earth lists it at $29,150. 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

5.28
Carat
D
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.9°
Pavilion angle33.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780661346
Dimensions12.25 × 8.73 × 5.59 mm
L/W Ratio1.40
Culet sizePointed
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
12.25 mm8.73 mm5.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780661346
Side View
Table 66.0%Crown 41.9°Girdle: Slightly ThickPavilion 33.1°Culet: NoneDepth 64.0%

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 27
Current: $29,150 USD|Low: $8,686 USD|High: $60,700 USD|Avg: $18,406 USD|-3.0%
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
Retailer 14
Retailer 15
October 29, 2026
Retailer 9$8,686 USD
Retailer 6$8,750 USD
Retailer 11$8,820 USD
Retailer 3$9,033 USD
Retailer 14$9,980 USD
Retailer 12$11,208 USD
Retailer 10$11,657 USD
Retailer 8$12,045 USD
Retailer 15$12,508 USD
Retailer 7$12,546 USD
Retailer 5$19,591 USD
Retailer 2$19,958 USD
Retailer 4$28,057 USD
Brilliant Earth$29,150 USD
Retailer 13$54,200 USD

38 data points across 15 retailers

15 retailers$8,686 USD to $29,150 USD

A
Cheapest Retailer
-
$8,686 USD
A
Retailer 2
-
$8,750 USD
View
A
Retailer 3
-
$8,820 USD
View
A
Retailer 4
-
$9,033 USD
View
A
Retailer 5
-
$9,980 USD
View
A
Retailer 6
-
$11,208 USD
View
A
Retailer 7
-
$11,657 USD
View
A
Retailer 8
-
$12,045 USD
View
A
Retailer 9
-
$12,508 USD
View
A
Retailer 10
-
$12,546 USD
View
Final sale: no returns
B+
Retailer 11
-
$19,591 USD
€18,658 EUR
View
B+
Retailer 12
-
$19,958 USD
£15,715 GBP
View
B+
Retailer 13
-
$28,057 USD
View
Most Expensive
B
Brilliant Earth
18350423Y · Oct 29
$29,150 USD
View
13 more retailers have this diamond
Prices start from $8,686 USDSave up to $20,464 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
5.28ct Radiant
$8,686 USD