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Marquise|Natural|GIA

0.66ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 1557148705

Certificate GIA 1557148705

Diamond specifications and retailer prices

From £399 GBP
SGD 723 SGD
As of October 31, 2026
Save £364 GBP (48%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £763 GBP at Frank Darling · As of October 31, 2026
View at Frank Darling

About this 0.66ct natural marquise diamond

This 0.66ct natural marquise sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1557148705. Listed at 9 retailers as of October 31, 2026, with prices from £399 to £763, a £364 spread on the same certified stone. Frank Darling lists it at £763. 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

0.66
Carat
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle39.67°
Pavilion angle39.39°
OriginNatural
Grading LabGIA
CertificateGIA 1557148705
Dimensions8.66 × 4.56 × 2.81 mm
L/W Ratio1.90
Culet sizeNone
Top View
8.66 mm4.56 mm0.66 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1557148705
Side View
Table 60.0%Crown 39.67°Girdle: VTN-VTKPavilion 39.39°Culet: NoneDepth 61.7%

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: £763 GBP|Low: £281 GBP|High: £847 GBP|Avg: £610 GBP|-8.1%
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 11£329 GBP
Retailer 8£399 GBP
Retailer 9£446 GBP
Retailer 6£511 GBP
Retailer 12£562 GBP
Retailer 5£580 GBP
Retailer 7£624 GBP
Retailer 2£628 GBP
Retailer 4£641 GBP
Retailer 10£677 GBP
Frank Darling£763 GBP
Retailer 3£847 GBP

25 data points across 12 retailers

9 retailers£399 GBP to £763 GBP

A
Cheapest Retailer
-
£399 GBP
SGD 723 SGD
A
Retailer 2
-
£446 GBP
SGD 809 SGD
View
A
Retailer 3
-
£511 GBP
View
A
Retailer 4
-
£580 GBP
$779 USD
View
A
Retailer 5
-
£624 GBP
$838 USD
View
A
Retailer 6
-
£628 GBP
€803 EUR
View
B+
Retailer 7
-
£641 GBP
$860 USD
View
B+
Retailer 8
-
£677 GBP
$909 USD
View
Most Expensive
B+
Frank Darling
2632130HK · Oct 31
£763 GBP
$1,023 USD
View
8 more retailers have this diamond
Prices start from £399 GBPSave up to £364 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
0.66ct Marquise
£399 GBP