Marquise|Lab Grown|IGI

4.20ct D FL Marquise Lab Grown Diamond

EX • D/FL • IGI LG805610569

Certificate IGI LG805610569

Diamond specifications and retailer prices

From $8,334 USD
Save $27,534 USD (77%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: $35,868 USD at Taylor and Hart
View at Taylor and Hart

About this 4.2ct lab-grown marquise diamond

This 4.2ct lab-grown marquise sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG805610569 or 805610569. Listed at 28 retailers, with prices from $8,334 to $35,868 at Taylor and Hart, a $27,534 spread on the same certified stone. 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

4.20
Carat
D
Color
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG805610569
Dimensions16.36 × 8.45 × 5.26 mm
L/W Ratio1.94
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
16.36 mm8.45 mm4.20 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG805610569
Side View
Table 59.0%Crown 34.3°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0-100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Sep 30
Current: $18,203 USD|Low: $7,967 USD|High: $58,377 USD|Avg: $19,489 USD|-11.4%
Retailer 1
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Retailer 25
Taylor and Hart
October 1, 2026
Retailer 20$8,334 USD
Retailer 17$9,096 USD
Retailer 19$9,960 USD
Retailer 22$10,359 USD
Retailer 13$10,443 USD
Retailer 9$10,688 USD
Retailer 12$10,828 USD
Retailer 4$11,360 USD
Retailer 3$11,394 USD
Retailer 14$11,420 USD
Retailer 10$11,508 USD
Retailer 25$11,554 USD
Retailer 2$13,445 USD
Retailer 24$14,151 USD
Retailer 7$16,551 USD
Retailer 1$18,203 USD
Retailer 23$18,785 USD
Retailer 18$19,976 USD
Retailer 6$22,730 USD
Retailer 15$23,251 USD
Retailer 5$23,668 USD
Retailer 21$24,146 USD
Retailer 8$30,252 USD
Retailer 16$32,189 USD
Taylor and Hart$35,868 USD
Retailer 11$58,377 USD

29 data points across 26 retailers

28 retailers$8,334 USD to $35,868 USD

A
Cheapest Retailer
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$8,334 USD
A
Retailer 2
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$9,712 USD
View
Price last confirmed 20 days ago
A
Retailer 3
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$9,960 USD
View
A
Retailer 4
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$10,359 USD
View
A
Retailer 5
-
$10,443 USD
CA$14,504 CAD
View
A
Retailer 6
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$10,688 USD
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A
Retailer 7
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$10,828 USD
View
A
Retailer 8
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$11,360 USD
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A
Retailer 9
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$11,394 USD
View
A
Retailer 10
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$11,420 USD
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A
Retailer 11
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$11,508 USD
View
A
Retailer 12
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$11,554 USD
View
B+
Retailer 13
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$13,445 USD
View
B+
Retailer 14
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$14,140 USD
£11,134 GBP
View
B+
Retailer 15
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$16,551 USD
£13,032 GBP
View
B+
Retailer 16
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$18,203 USD
€17,336 EUR
View
B+
Retailer 17
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$18,785 USD
£14,791 GBP
View
B+
Retailer 18
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$19,976 USD
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B+
Retailer 19
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$20,984 USD
View
B+
Retailer 20
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$22,730 USD
View
B
Retailer 21
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$23,251 USD
View
B
Retailer 22
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$23,668 USD
View
Price last confirmed 8 days ago
B
Retailer 23
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$23,820 USD
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Price last confirmed 20 days ago
B
Retailer 24
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$24,146 USD
ZAR 390,076 ZAR
View
B
Retailer 25
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$30,252 USD
View
B
Retailer 26
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$32,189 USD
View
Most Expensive
B
Taylor and Hart
3B90XIH · Sep 30
$35,868 USD
View
26 more retailers have this diamond
Prices start from $8,334 USDSave up to $27,534 USD

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.

A
4.20ct Marquise
$8,334 USD