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Round|Lab Grown|IGI

3.75ct F SI1 Round Lab Grown Diamond

ID • F/SI1

Diamond specifications and retailer prices

From £370 GBP
$497 USD
As of November 1, 2026
Save £1,555 GBP (81%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,926 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 3.75ct lab-grown round diamond

This 3.75ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 9 retailers as of October 31, 2026, with prices from £370 to £1,926, a £1,555 spread on the same certified stone. Blue Nile lists it at £1,926. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.75
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions10.07 × 10.11 × 6.08 mm
L/W Ratio1.00
Top View
10.07 mm10.11 mm3.75 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 58.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 60.2%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: £1,926 GBP|Low: £303 GBP|High: £1,926 GBP|Avg: £937 GBP
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 20, 2026
Retailer 4£370 GBP
Retailer 2£414 GBP
Retailer 3£459 GBP
Retailer 6£1,143 GBP
Retailer 5£1,207 GBP
Blue Nile£1,926 GBP

10 data points across 6 retailers

9 retailers£370 GBP to £1,926 GBP

A
Cheapest Retailer
-
£370 GBP
$497 USD
Retailer 2
-
£370 GBP
$497 USD
View
Price last confirmed 22 days ago
A
Retailer 3
-
£414 GBP
$556 USD
View
Retailer 4
-
£414 GBP
$556 USD
View
Price last confirmed 24 days ago
A
Retailer 5
-
£459 GBP
$616 USD
View
Retailer 6
-
£459 GBP
$616 USD
View
Price last confirmed 23 days ago
Retailer 7
-
£1,207 GBP
$1,620 USD
View
Price last confirmed 23 days ago
B
Retailer 8
-
£1,207 GBP
$1,620 USD
View
Most Expensive
B
Blue Nile
25247387 · Oct 31
£1,926 GBP
$2,584 USD
View
8 more retailers have this diamond
Prices start from £370 GBPSave up to £1,555 GBP

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
3.75ct Round
£370 GBP