CaratHunter
Plans
Cushion|Lab Grown|GCAL

5.18ct D FL Cushion Lab Grown Diamond

ID • D/FL

Diamond specifications and retailer prices

From $13,500 AUD
$9,483 USD
As of October 31, 2026
Save $31,527 AUD (70%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $45,027 AUD 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 $13,500 to $45,027, a $31,527 spread on the same certified stone. Blue Nile lists it at $45,027. 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: $45,027 AUD|Low: $13,500 AUD|High: $206,835 AUD|Avg: $48,114 AUD|-36.1%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 29, 2026
Retailer 6$13,500 AUD
Retailer 3$16,011 AUD
Retailer 2$27,360 AUD
Retailer 5$42,818 AUD
Blue Nile$45,027 AUD
Retailer 4$82,555 AUD

17 data points across 6 retailers

6 retailers$13,500 AUD to $45,027 AUD

A
Cheapest Retailer
-
$13,500 AUD
$9,483 USD
A
Retailer 2
-
$14,410 AUD
$10,122 USD
View
B+
Retailer 3
-
$27,360 AUD
£15,133 GBP
View
B
Retailer 4
-
$42,818 AUD
$30,077 USD
View
Most Expensive
B
Blue Nile
30235026 · Oct 31
$45,027 AUD
$31,629 USD
View
4 more retailers have this diamond
Prices start from $13,500 AUDSave up to $31,527 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
5.18ct Cushion
$13,500 AUD