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Round|Lab Grown|IGI

1.51ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG770643638

Shape and cutting style on the report: Round brilliant

Certificate IGI LG770643638

Diamond specifications and retailer prices

From $249 USD
As of November 4, 2026
Save $1,020 USD (80%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $1,420 USD at Brilliant Earth · As of October 16, 2026
View at Brilliant Earth

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG770643638 or 770643638. Listed at 22 retailers as of November 4, 2026, with a 410% 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

1.51
Carat
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770643638
Dimensions7.36 × 7.31 × 4.56 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.36 mm7.31 mm1.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG770643638
Side View
Table 56.0%Crown 35.1°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.3%

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: $1,420 USD|Low: $213 USD|High: $1,420 USD|Avg: $624 USD
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
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 9$224 USD
Retailer 16$249 USD
Retailer 5$277 USD
Retailer 17$277 USD
Retailer 3$435 USD
Retailer 6$473 USD
Retailer 2$480 USD
Retailer 11$506 USD
Retailer 12$510 USD
Retailer 4$531 USD
Retailer 18$577 USD
Retailer 14$730 USD
Retailer 10$892 USD
Retailer 15$895 USD
Retailer 8$944 USD
Retailer 13$1,108 USD
Retailer 7$1,269 USD
Brilliant Earth$1,420 USD

41 data points across 18 retailers

22 retailers$249 USD to $1,269 USD

Retailer 1
-
$224 USD
Price last confirmed 19 days ago
A
Retailer 2
-
$249 USD
View
Final sale: no returns
Retailer 3
-
$257 USD
View
Price last confirmed 24 days ago
A
Retailer 4
-
$260 USD
View
Retailer 5
-
$277 USD
View
Price last confirmed 12 days ago
Retailer 6
-
$277 USD
View
Price last confirmed 21 days ago
A
Retailer 7
-
$435 USD
View
A
Retailer 8
-
$473 USD
View
A
Retailer 9
-
$480 USD
View
A
Retailer 10
-
$506 USD
View
A
Retailer 11
-
$510 USD
View
B+
Retailer 12
-
$531 USD
View
B+
Retailer 13
-
$577 USD
View
B+
Retailer 14
-
$730 USD
View
B
Retailer 15
-
$771 USD
View
Retailer 16
-
$884 USD
View
Price last confirmed 46 days ago
Retailer 17
-
$892 USD
View
Price last confirmed 19 days ago
B
Retailer 18
-
$895 USD
View
B
Retailer 19
-
$944 USD
View
B
Retailer 20
-
$1,108 USD
View
B
Retailer 21
-
$1,269 USD
View
Most Expensive
Brilliant Earth
19882042A · Oct 16
$1,420 USD
View
Price last confirmed 20 days ago
21 more retailers have this diamond
Prices start from $249 USDSave up to $1,020 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
1.51ct Round
$249 USD