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Cushion|Lab Grown|GCAL

5.18ct D FL Cushion Lab Grown Diamond

ID • D/FL

Diamond specifications and retailer prices

From $16,826 NZD
$9,483 USD
As of October 31, 2026
Save $39,294 NZD (70%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $56,119 NZD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 5.18ct lab-grown cushion diamond

This 5.18ct lab-grown cushion sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by GCAL. Listed at 6 retailers as of October 31, 2026, with prices from $16,826 to $56,119, a $39,294 spread on the same certified stone. Blue Nile lists it at $56,119. 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

5.18
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabGCAL
Dimensions11.78 × 8.77 × 6.15 mm
L/W Ratio1.34
Top View
11.78 mm8.77 mm5.18 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGCAL
Side View
Table 61.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 70.1%

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: $56,119 NZD|Low: $16,826 NZD|High: $257,788 NZD|Avg: $59,199 NZD|-36.1%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 6$16,826 NZD
Retailer 3$19,956 NZD
Retailer 2$33,920 NZD
Retailer 5$53,366 NZD
Blue Nile$56,119 NZD
Retailer 4$102,892 NZD

18 data points across 6 retailers

6 retailers$16,826 NZD to $56,119 NZD

A
Cheapest Retailer
-
$16,826 NZD
$9,483 USD
A
Retailer 2
-
$17,959 NZD
$10,122 USD
View
B+
Retailer 3
-
$33,920 NZD
£15,053 GBP
View
B
Retailer 4
-
$53,366 NZD
$30,077 USD
View
Most Expensive
B
Blue Nile
30235026 · Oct 31
$56,119 NZD
$31,629 USD
View
4 more retailers have this diamond
Prices start from $16,826 NZDSave up to $39,294 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
5.18ct Cushion
$16,826 NZD