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Round|Lab Grown|IGI

4.51ct E IF Round Lab Grown Diamond

ID • E/IF • IGI LG711511146

Shape and cutting style on the report: Round brilliant

Certificate IGI LG711511146

Diamond specifications and retailer prices

From $4,275 USD
As of October 31, 2026
Save $8,305 USD (66%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $12,580 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 4.51ct lab-grown round diamond

This 4.51ct lab-grown round sits in the three to five carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG711511146 or 711511146. Listed at 2 retailers as of October 31, 2026, with prices from $4,275 to $12,580, a $8,305 spread on the same certified stone. Brilliant Earth lists it at $12,580. 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

4.51
Carat
E
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG711511146
Dimensions10.70 × 10.65 × 6.49 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS 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
10.70 mm10.65 mm4.51 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG711511146
Side View
Table 58.0%Crown 34.4°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 60.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 31
Current: $12,580 USD|Low: $4,275 USD|High: $20,187 USD|Avg: $12,531 USD|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 16, 2026
Retailer 2$4,275 USD
Retailer 3$6,381 USD
Brilliant Earth$12,580 USD
Retailer 5$13,640 USD
Retailer 4$17,520 USD
Retailer 6$20,187 USD

5 data points across 6 retailers

2 retailers$4,275 USD to $12,580 USD

A
Cheapest Retailer
-
$4,275 USD
Most Expensive
B
Brilliant Earth
21403481Y · Oct 31
$12,580 USD
View
1 more retailer has this diamond
Prices start from $4,275 USDSave up to $8,305 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
4.51ct Round
$4,275 USD