CaratHunter
Plans
Marquise|Lab Grown|IGI

3.51ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG717540398

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG717540398

Diamond specifications and retailer prices

From $5,188 USD
As of October 30, 2026
Save $16,328 USD (76%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: $21,516 USD at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 3.51ct lab-grown marquise diamond

This 3.51ct lab-grown marquise 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 LG717540398 or 717540398. Listed at 26 retailers as of October 30, 2026, with prices from $5,188 to $21,516, a $16,328 spread on the same certified stone. Taylor and Hart lists it at $21,516. 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

3.51
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG717540398
Dimensions15.19 × 7.82 × 5.07 mm
L/W Ratio1.94
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.19 mm7.82 mm3.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG717540398
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 64.8%

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: $5,810 USD|Low: $5,188 USD|High: $21,516 USD|Avg: $9,598 USD
Retailer 1
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
Taylor and Hart
November 1, 2026
Retailer 9$5,188 USD
Retailer 7$5,501 USD
Retailer 1$5,810 USD
Retailer 8$6,018 USD
Retailer 5$6,035 USD
Retailer 4$6,916 USD
Retailer 10$7,144 USD
Retailer 14$7,160 USD
Retailer 3$7,215 USD
Retailer 18$7,683 USD
Retailer 11$8,534 USD
Retailer 2$8,825 USD
Retailer 19$9,645 USD
Retailer 6$11,333 USD
Retailer 12$12,245 USD
Retailer 16$13,020 USD
Retailer 13$13,948 USD
Retailer 17$13,972 USD
Retailer 15$19,906 USD
Taylor and Hart$21,516 USD

29 data points across 20 retailers

26 retailers$5,188 USD to $21,516 USD

A
Cheapest Retailer
-
$5,188 USD
A
Retailer 2
-
$5,501 USD
View
A
Retailer 3
-
$5,810 USD
View
Final sale: no returns
A
Retailer 4
-
$6,018 USD
View
A
Retailer 5
-
$6,035 USD
View
Retailer 6
-
$6,464 USD
View
Price last confirmed 33 days ago
Retailer 7
-
$6,464 USD
£5,090 GBP
View
Price last confirmed 22 days ago
Retailer 8
-
$6,685 USD
View
Price last confirmed 56 days ago
A
Retailer 9
-
$6,916 USD
View
Retailer 10
-
$7,056 USD
View
Price last confirmed 34 days ago
A
Retailer 11
-
$7,144 USD
View
A
Retailer 12
-
$7,160 USD
£5,638 GBP
View
B+
Retailer 13
-
$7,215 USD
View
B+
Retailer 14
-
$7,683 USD
£6,050 GBP
View
B+
Retailer 15
-
$8,534 USD
£6,720 GBP
View
B+
Retailer 16
-
$8,825 USD
View
Retailer 17
-
$8,972 USD
View
Price last confirmed 33 days ago
B+
Retailer 18
-
$9,645 USD
€9,186 EUR
View
B+
Retailer 19
-
$11,333 USD
View
B+
Retailer 20
-
$12,245 USD
£9,642 GBP
View
B+
Retailer 21
-
$13,020 USD
View
B
Retailer 22
-
$13,948 USD
A$21,459 AUD
View
B+
Retailer 23
-
$13,972 USD
ZAR 225,716 ZAR
View
Retailer 24
-
$15,410 USD
View
Price last confirmed 9 days ago
B
Retailer 25
-
$19,906 USD
A$30,624 AUD
View
Most Expensive
B
Taylor and Hart
CY2A19R · Oct 31
$21,516 USD
View
25 more retailers have this diamond
Prices start from $5,188 USDSave up to $16,328 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. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
3.51ct Marquise
$5,188 USD