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Round|Lab Grown|IGI

2.78ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG845699634

Shape and cutting style on the report: Round brilliant

Certificate IGI LG845699634

Diamond specifications and retailer prices

From $1,423 AUD
£787 GBP
As of November 1, 2026
Save $17,383 AUD (92%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $18,806 AUD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 2.78ct lab-grown round diamond

This 2.78ct lab-grown round sits in the two to three carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG845699634 or 845699634. Listed at 14 retailers as of October 29, 2026, with prices from $1,423 to $18,806, a $17,383 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

2.78
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG845699634
Dimensions8.99 × 9.07 × 5.56 mm
L/W Ratio1.01
Girdle conditionFaceted
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
8.99 mm9.07 mm2.78 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG845699634
Side View
Table 57.0%Crown 34.6°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 61.5%

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 1
Current: $4,719 AUD|Low: $1,423 AUD|High: $4,968 AUD|Avg: $2,971 AUD|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 1, 2026
Retailer 7$1,423 AUD
Retailer 4$1,458 AUD
Retailer 2$1,668 AUD
Retailer 9$1,906 AUD
Retailer 11$1,967 AUD
Retailer 12$2,037 AUD
Retailer 10$3,248 AUD
Retailer 3$3,310 AUD
Retailer 8$4,239 AUD
Retailer 6$4,254 AUD
Retailer 13$4,255 AUD
Retailer 5$4,346 AUD
Retailer 1$4,719 AUD

11 data points across 13 retailers

14 retailers$1,423 AUD to $18,806 AUD

A
Cheapest Retailer
-
$1,423 AUD
£787 GBP
A
Retailer 2
-
$1,458 AUD
HK$8,000 HKD
View
A
Retailer 3
-
$1,668 AUD
$1,172 USD
View
A
Retailer 4
-
$1,906 AUD
£1,054 GBP
View
A
Retailer 5
-
$1,967 AUD
€1,316 EUR
View
A
Retailer 6
-
$2,037 AUD
$1,431 USD
View
A
Retailer 7
-
$3,248 AUD
ZAR 36,854 ZAR
View
A
Retailer 8
-
$3,310 AUD
$2,325 USD
View
B+
Retailer 9
-
$4,239 AUD
SGD 4,024 SGD
View
B+
Retailer 10
-
$4,254 AUD
$2,988 USD
View
B+
Retailer 11
-
$4,255 AUD
$2,989 USD
View
B+
Retailer 12
-
$4,346 AUD
$3,053 USD
View
B+
Retailer 13
-
$4,719 AUD
£2,610 GBP
View
Most Expensive
B
Brilliant Earth
22283664A · Oct 29
$18,806 AUD
$13,210 USD
View
13 more retailers have this diamond
Prices start from $1,423 AUDSave up to $17,383 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
2.78ct Round
$1,423 AUD