Radiant|Lab Grown|IGI

1.55ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG743509309

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

Certificate IGI LG743509309

Diamond specifications and retailer prices

From $328 USD
As of October 30, 2026
Save $2,592 USD (89%) vs most expensive(unlock to see where)
31 retailers carry this diamond
Most expensive: $2,920 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.55ct lab-grown radiant diamond

This 1.55ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG743509309 or 743509309. Listed at 31 retailers as of October 30, 2026, with prices from $328 to $2,920, a $2,592 spread on the same certified stone. Brilliant Earth lists it at $2,920. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.55
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.5°
Pavilion angle32.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG743509309
Dimensions8.16 × 5.85 × 3.74 mm
L/W Ratio1.39
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
8.16 mm5.85 mm1.55 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG743509309
Side View
Table 65.0%Crown 42.5°Girdle: MED-STKPavilion 32.7°Culet: NoneDepth 63.9%

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 30
Current: $2,920 USD|Low: $328 USD|High: $4,300 USD|Avg: $1,187 USD|-32.1%
Brilliant Earth
Retailer 2
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Retailer 22
November 2, 2026
Retailer 3$328 USD
Retailer 16$391 USD
Retailer 10$474 USD
Retailer 19$515 USD
Retailer 4$572 USD
Retailer 18$659 USD
Retailer 8$665 USD
Retailer 2$702 USD
Retailer 13$728 USD
Retailer 9$921 USD
Retailer 20$946 USD
Retailer 5$1,067 USD
Retailer 22$1,194 USD
Retailer 12$1,353 USD
Retailer 15$1,360 USD
Retailer 14$1,361 USD
Retailer 7$1,537 USD
Retailer 6$1,603 USD
Retailer 17$1,631 USD
Retailer 11$1,687 USD
Retailer 21$2,575 USD
Brilliant Earth$2,920 USD

36 data points across 22 retailers

31 retailers$328 USD to $2,920 USD

A
Cheapest Retailer
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$328 USD
Retailer 2
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$328 USD
View
Price last confirmed 25 days ago
Retailer 3
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$349 USD
View
Price last confirmed 33 days ago
A
Retailer 4
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$391 USD
View
Final sale: no returns
Retailer 5
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$405 USD
View
Price last confirmed 36 days ago
Retailer 6
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$407 USD
View
Price last confirmed 30 days ago
Retailer 7
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$427 USD
View
Price last confirmed 36 days ago
Retailer 8
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$427 USD
View
Price last confirmed 33 days ago
A
Retailer 9
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$474 USD
HK$3,700 HKD
View
A
Retailer 10
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$515 USD
View
A
Retailer 11
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$572 USD
View
A
Retailer 12
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$659 USD
€628 EUR
View
A
Retailer 13
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$665 USD
View
A
Retailer 14
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$702 USD
ZAR 11,339 ZAR
View
A
Retailer 15
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$728 USD
£573 GBP
View
A
Retailer 16
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$921 USD
View
A
Retailer 17
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$946 USD
A$1,456 AUD
View
B+
Retailer 18
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$1,067 USD
View
B+
Retailer 19
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$1,194 USD
View
B+
Retailer 20
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$1,308 USD
View
Retailer 21
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$1,308 USD
View
Price last confirmed 23 days ago
B+
Retailer 22
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$1,353 USD
View
B+
Retailer 23
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$1,360 USD
View
B+
Retailer 24
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$1,361 USD
SGD 1,839 SGD
View
Retailer 25
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$1,391 USD
View
Price last confirmed 32 days ago
B+
Retailer 26
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$1,537 USD
View
B+
Retailer 27
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$1,603 USD
View
B+
Retailer 28
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$1,631 USD
£1,284 GBP
View
Retailer 29
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$1,687 USD
A$2,596 AUD
View
Price last confirmed 31 days ago
B
Retailer 30
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$2,575 USD
View
Most Expensive
B
Brilliant Earth
16656137A · Oct 31
$2,920 USD
View
30 more retailers have this diamond
Prices start from $328 USDSave up to $2,592 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
1.55ct Radiant
$328 USD