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Round|Lab Grown|IGI

4.18ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG683520148

Shape and cutting style on the report: Round brilliant

Certificate IGI LG683520148

Diamond specifications and retailer prices

From $3,271 NZD
£1,452 GBP
As of October 30, 2026
Save $20,043 NZD (86%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: $28,052 NZD at Brilliant Earth · As of October 24, 2026
View at Brilliant Earth

About this 4.18ct lab-grown round diamond

This 4.18ct 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 LG683520148 or 683520148. Listed at 28 retailers as of October 30, 2026, with a 613% 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

4.18
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.6°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG683520148
Dimensions10.53 × 10.48 × 6.25 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
10.53 mm10.48 mm4.18 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG683520148
Side View
Table 58.0%Crown 33.6°Girdle: MediumPavilion 40.4°Culet: NoneDepth 59.5%

Caratlytics Score

How it works →
A+
Exceptional
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: $23,314 NZD|Low: $3,260 NZD|High: $28,052 NZD|Avg: $9,069 NZD|-16.9%
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
Retailer 17
Retailer 18
Retailer 19
Retailer 20
Retailer 21
November 1, 2026
Retailer 15$3,271 NZD
Retailer 14$3,636 NZD
Retailer 6$3,689 NZD
Retailer 8$3,820 NZD
Retailer 13$4,116 NZD
Retailer 20$4,219 NZD
Retailer 5$4,996 NZD
Retailer 2$5,732 NZD
Retailer 19$5,988 NZD
Retailer 4$6,348 NZD
Retailer 3$6,427 NZD
Retailer 17$8,257 NZD
Retailer 16$8,977 NZD
Retailer 12$9,050 NZD
Retailer 10$10,294 NZD
Retailer 18$10,735 NZD
Retailer 9$10,832 NZD
Retailer 7$12,060 NZD
Retailer 11$14,457 NZD
Retailer 21$22,658 NZD
Brilliant Earth$23,314 NZD

30 data points across 21 retailers

28 retailers$3,271 NZD to $23,314 NZD

A+
Cheapest Retailer
-
$3,271 NZD
£1,452 GBP
Retailer 2
-
$3,636 NZD
$2,049 USD
View
Price last confirmed 9 days ago
A
Retailer 3
-
$3,689 NZD
$2,079 USD
View
Final sale: no returns
A
Retailer 4
-
$3,820 NZD
$2,153 USD
View
Retailer 5
-
$3,955 NZD
$2,229 USD
View
Price last confirmed 11 days ago
A
Retailer 6
-
$4,116 NZD
$2,320 USD
View
Retailer 7
-
$4,218 NZD
$2,377 USD
View
Price last confirmed 21 days ago
A
Retailer 8
-
$4,219 NZD
$2,378 USD
View
A
Retailer 9
-
$4,996 NZD
HK$22,000 HKD
View
A
Retailer 10
-
$5,732 NZD
£2,544 GBP
View
Retailer 11
-
$5,797 NZD
$3,267 USD
View
Price last confirmed 10 days ago
A
Retailer 12
-
$5,988 NZD
$3,375 USD
View
A
Retailer 13
-
$6,348 NZD
$3,578 USD
View
A
Retailer 14
-
$6,427 NZD
$3,622 USD
View
A
Retailer 15
-
$8,257 NZD
€4,432 EUR
View
A
Retailer 16
-
$8,977 NZD
ZAR 81,735 ZAR
View
Retailer 17
-
$9,050 NZD
A$7,847 AUD
View
Price last confirmed 9 days ago
A
Retailer 18
-
$10,294 NZD
$5,802 USD
View
B+
Retailer 19
-
$10,735 NZD
$6,050 USD
View
A
Retailer 20
-
$10,832 NZD
$6,105 USD
View
B+
Retailer 21
-
$11,865 NZD
$6,687 USD
View
B+
Retailer 22
-
$12,060 NZD
£5,352 GBP
View
B+
Retailer 23
-
$14,457 NZD
SGD 11,011 SGD
View
B+
Retailer 24
-
$14,753 NZD
$8,315 USD
View
Retailer 25
-
$16,720 NZD
£7,420 GBP
View
Price last confirmed 22 days ago
B
Retailer 26
-
$22,658 NZD
$12,770 USD
View
B+
Retailer 27
-
$23,314 NZD
$13,140 USD
View
Most Expensive
Brilliant Earth
13152316A · Oct 24
$28,052 NZD
$15,810 USD
View
Price last confirmed 7 days ago
27 more retailers have this diamond
Prices start from $3,271 NZDSave up to $20,043 NZD

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+
4.18ct Round
$3,271 NZD