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Round|Lab Grown|IGI

4.51ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG712591461

Shape and cutting style on the report: Round brilliant

Certificate IGI LG712591461

Diamond specifications and retailer prices

From $6,619 AUD
£3,661 GBP
As of October 30, 2026
Save $39,221 AUD (86%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $53,806 AUD at Mervis Diamond Importers · As of October 31, 2026
View at Mervis Diamond Importers

About this 4.51ct lab-grown round diamond

This 4.51ct 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 LG712591461 or 712591461. Listed at 24 retailers as of October 30, 2026, with a 593% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG712591461
Dimensions10.55 × 10.60 × 6.53 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
10.55 mm10.60 mm4.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG712591461
Side View
Table 57.0%Crown 34.1°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.8%

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 30
Current: $53,806 AUD|Low: $6,398 AUD|High: $53,806 AUD|Avg: $17,183 AUD
Mervis Diamond Importers
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
October 31, 2026
Retailer 11$6,619 AUD
Retailer 17$6,664 AUD
Retailer 8$7,381 AUD
Retailer 9$7,463 AUD
Retailer 4$7,730 AUD
Retailer 6$7,730 AUD
Retailer 16$7,780 AUD
Retailer 15$9,871 AUD
Retailer 2$10,878 AUD
Retailer 5$11,954 AUD
Retailer 13$17,454 AUD
Retailer 12$18,159 AUD
Retailer 14$18,792 AUD
Retailer 3$19,566 AUD
Retailer 7$24,482 AUD
Retailer 10$25,255 AUD
Retailer 18$38,181 AUD
Mervis Diamond Importers$53,806 AUD

44 data points across 18 retailers

24 retailers$6,619 AUD to $45,840 AUD

A
Cheapest Retailer
-
$6,619 AUD
£3,661 GBP
A
Retailer 2
-
$6,664 AUD
$4,681 USD
View
A
Retailer 3
-
$6,742 AUD
$4,736 USD
View
A
Retailer 4
-
$6,983 AUD
$4,905 USD
View
A
Retailer 5
-
$7,381 AUD
$5,185 USD
View
A
Retailer 6
-
$7,463 AUD
$5,242 USD
View
Final sale: no returns
Retailer 7
-
$7,730 AUD
$5,430 USD
View
Price last confirmed 14 days ago
A
Retailer 8
-
$7,730 AUD
$5,430 USD
View
A
Retailer 9
-
$7,780 AUD
$5,465 USD
View
B+
Retailer 10
-
$9,871 AUD
$6,934 USD
View
B+
Retailer 11
-
$10,129 AUD
$7,115 USD
View
B+
Retailer 12
-
$10,878 AUD
£6,016 GBP
View
B+
Retailer 13
-
$11,954 AUD
$8,397 USD
View
B+
Retailer 14
-
$17,454 AUD
£9,654 GBP
View
B+
Retailer 15
-
$18,159 AUD
ZAR 206,072 ZAR
View
Retailer 16
-
$18,792 AUD
View
Price last confirmed 8 days ago
B
Retailer 17
-
$19,566 AUD
$13,744 USD
View
B
Retailer 18
-
$21,276 AUD
$14,946 USD
View
B
Retailer 19
-
$24,482 AUD
$17,197 USD
View
B
Retailer 20
-
$25,255 AUD
$17,741 USD
View
B
Retailer 21
-
$30,528 AUD
$21,444 USD
View
B
Retailer 22
-
$38,181 AUD
$26,820 USD
View
B
Retailer 23
-
$45,840 AUD
$32,200 USD
View
Most Expensive
Mervis Diamond Importers
1985409131 · Oct 31
$53,806 AUD
$37,796 USD
View
Price under review
23 more retailers have this diamond
Prices start from $6,619 AUDSave up to $39,221 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
4.51ct Round
$6,619 AUD