CaratHunter
Plans
Round|Lab Grown|IGI

4.08ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG728518789

Shape and cutting style on the report: Round brilliant

Certificate IGI LG728518789

Diamond specifications and retailer prices

From $645 USD
As of October 31, 2026
Save $3,635 USD (85%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $4,280 USD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 4.08ct lab-grown round diamond

This 4.08ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG728518789 or 728518789. Listed at 17 retailers as of October 29, 2026, with prices from $645 to $4,280, a $3,635 spread on the same certified stone. Brilliant Earth lists it at $4,280. 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

4.08
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728518789
Dimensions10.23 × 10.21 × 6.33 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.23 mm10.21 mm4.08 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728518789
Side View
Table 58.0%Crown 35.1°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $4,280 USD|Low: $645 USD|High: $4,390 USD|Avg: $1,582 USD|-2.5%
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
October 31, 2026
Retailer 6$645 USD
Retailer 13$714 USD
Retailer 9$798 USD
Retailer 7$845 USD
Retailer 12$958 USD
Retailer 14$1,030 USD
Retailer 2$1,072 USD
Retailer 8$1,103 USD
Retailer 5$1,700 USD
Retailer 11$1,773 USD
Retailer 3$2,282 USD
Retailer 4$2,314 USD
Retailer 10$3,118 USD
Brilliant Earth$4,280 USD

42 data points across 14 retailers

17 retailers$645 USD to $4,280 USD

A
Cheapest Retailer
-
$645 USD
Final sale: no returns
Retailer 2
-
$714 USD
View
Price last confirmed 15 days ago
Retailer 3
-
$735 USD
View
Price last confirmed 32 days ago
A
Retailer 4
-
$798 USD
£628 GBP
View
A
Retailer 5
-
$845 USD
View
B+
Retailer 6
-
$958 USD
View
A
Retailer 7
-
$1,030 USD
View
A
Retailer 8
-
$1,072 USD
€1,021 EUR
View
A
Retailer 9
-
$1,103 USD
£869 GBP
View
B+
Retailer 10
-
$1,700 USD
View
B+
Retailer 11
-
$1,773 USD
View
Retailer 12
-
$1,959 USD
View
Price last confirmed 31 days ago
B
Retailer 13
-
$2,282 USD
View
B
Retailer 14
-
$2,314 USD
View
Retailer 15
-
$2,683 USD
View
Price last confirmed 38 days ago
B
Retailer 16
-
$3,118 USD
£2,455 GBP
View
Most Expensive
B
Brilliant Earth
18586919A · Oct 29
$4,280 USD
View
16 more retailers have this diamond
Prices start from $645 USDSave up to $3,635 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
4.08ct Round
$645 USD