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0.66ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 1559266688

Certificate GIA 1559266688

Diamond specifications and retailer prices

From £355 GBP
SGD 644 SGD
As of October 31, 2026
Save £350 GBP (50%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £706 GBP at Frank Darling · As of November 2, 2026
View at Frank Darling

About this 0.66ct natural round diamond

This 0.66ct natural round sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559266688. Listed at 8 retailers as of October 31, 2026, with prices from £355 to £706, a £350 spread on the same certified stone. Frank Darling lists it at £706. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1559266688
Dimensions5.57 × 5.59 × 3.47 mm
L/W Ratio1.00
Culet sizeNone
Top View
5.57 mm5.59 mm0.66 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1559266688
Side View
Table 57.0%Crown 36°Girdle: THN-MEDPavilion 41°Culet: NoneDepth 62.1%

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: £706 GBP|Low: £237 GBP|High: £706 GBP|Avg: £491 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 9£237 GBP
Retailer 4£355 GBP
Retailer 10£387 GBP
Retailer 7£443 GBP
Retailer 8£503 GBP
Retailer 2£549 GBP
Retailer 3£563 GBP
Retailer 5£582 GBP
Retailer 6£595 GBP
Frank Darling£706 GBP

5 data points across 10 retailers

8 retailers£355 GBP to £706 GBP

A
Cheapest Retailer
-
£355 GBP
SGD 644 SGD
A
Retailer 2
-
£387 GBP
SGD 702 SGD
View
A
Retailer 3
-
£443 GBP
$594 USD
View
A
Retailer 4
-
£503 GBP
$675 USD
View
A
Retailer 5
-
£549 GBP
€702 EUR
View
A
Retailer 6
-
£563 GBP
View
Retailer 7
-
£582 GBP
$781 USD
View
Price last confirmed 7 days ago
Most Expensive
B+
Frank Darling
2640840HK · Nov 2
£706 GBP
$947 USD
View
7 more retailers have this diamond
Prices start from £355 GBPSave up to £350 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 Round
£355 GBP