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Marquise|Lab Grown

0.51ct G SI1 Marquise Lab Grown Diamond

EX • G/SI1 • FA4-181-1244

Diamond specifications and retailer prices

From £130 GBP
$174 USD
As of November 2, 2026
Save £388 GBP (75%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £518 GBP at NZ Jewellers · As of October 31, 2026
View at NZ Jewellers

About this 0.51ct lab-grown marquise diamond

This 0.51ct lab-grown marquise sits in the half to three-quarter carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade. Listed at 4 retailers as of October 31, 2026, with prices from £130 to £518, a £388 spread on the same certified stone. NZ Jewellers lists it at £518. 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

0.51
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading Lab
CertificateFA4-181-1244
Dimensions8.45 × 4.06 × 2.59 mm
L/W Ratio2.08
Top View
8.45 mm4.06 mm0.51 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateFA4-181-1244
Side View
Table 61.4%CrownGirdlePavilionCuletDepth 63.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £518 GBP|Low: £124 GBP|High: £518 GBP|Avg: £226 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
October 8, 2026
Retailer 2£130 GBP
Retailer 4£151 GBP
Retailer 3£161 GBP
NZ Jewellers£518 GBP

6 data points across 4 retailers

4 retailers£130 GBP to £518 GBP

B+
Cheapest Retailer
-
£130 GBP
$174 USD
B+
Retailer 2
-
£151 GBP
$202 USD
View
B+
Retailer 3
-
£161 GBP
$216 USD
View
Most Expensive
C
NZ Jewellers
a804e4ed-3906-4ec4-a2e8-87a2b9417107 · Oct 31
£518 GBP
$695 USD
View
3 more retailers have this diamond
Prices start from £130 GBPSave up to £388 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.

B+
0.51ct Marquise
£130 GBP