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Round|Lab Grown|IGI

4.20ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG768630985

Shape and cutting style on the report: Round brilliant

Certificate IGI LG768630985

Diamond specifications and retailer prices

From $2,716 AUD
$1,908 USD
As of November 1, 2026
Save $16,090 AUD (86%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $18,806 AUD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 4.2ct lab-grown round diamond

This 4.2ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG768630985 or 768630985. Listed at 16 retailers as of October 31, 2026, with prices from $2,716 to $18,806, a $16,090 spread on the same certified stone. Brilliant Earth lists it at $18,806. 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

4.20
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG768630985
Dimensions10.34 × 10.36 × 6.38 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
10.34 mm10.36 mm4.20 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG768630985
Side View
Table 56.0%Crown 34.3°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.6%

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: Nov 1
Current: $18,806 AUD|Low: $2,666 AUD|High: $34,593 AUD|Avg: $8,454 AUD|-45.6%
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
November 1, 2026
Retailer 13$2,716 AUD
Retailer 4$2,955 AUD
Retailer 14$3,290 AUD
Retailer 8$3,417 AUD
Retailer 6$4,086 AUD
Retailer 3$4,780 AUD
Retailer 12$4,934 AUD
Retailer 16$5,173 AUD
Retailer 7$5,226 AUD
Retailer 11$5,599 AUD
Retailer 5$7,260 AUD
Retailer 9$7,450 AUD
Retailer 2$9,436 AUD
Retailer 10$15,207 AUD
Retailer 15$18,692 AUD
Brilliant Earth$18,806 AUD

35 data points across 16 retailers

16 retailers$2,716 AUD to $18,806 AUD

A
Cheapest Retailer
-
$2,716 AUD
$1,908 USD
A
Retailer 2
-
$2,955 AUD
$2,076 USD
View
A
Retailer 3
-
$3,290 AUD
$2,311 USD
View
A
Retailer 4
-
$3,417 AUD
$2,400 USD
View
Final sale: no returns
A
Retailer 5
-
$4,086 AUD
$2,870 USD
View
A
Retailer 6
-
$4,780 AUD
$3,358 USD
View
A
Retailer 7
-
$4,934 AUD
$3,466 USD
View
A
Retailer 8
-
$5,173 AUD
$3,634 USD
View
A
Retailer 9
-
$5,226 AUD
$3,671 USD
View
A
Retailer 10
-
$5,599 AUD
€3,746 EUR
View
A
Retailer 11
-
$7,260 AUD
$5,100 USD
View
A
Retailer 12
-
$7,450 AUD
View
B+
Retailer 13
-
$9,436 AUD
£5,219 GBP
View
B+
Retailer 14
-
$15,207 AUD
View
B
Retailer 15
-
$18,692 AUD
$13,130 USD
View
Most Expensive
B
Brilliant Earth
18293994Y · Oct 31
$18,806 AUD
$13,210 USD
View
15 more retailers have this diamond
Prices start from $2,716 AUDSave up to $16,090 AUD

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
4.20ct Round
$2,716 AUD