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[[File:Logan Sapphire SI.jpg|right|thumb|alt=Large blue sapphire surrounded by twenty diamonds|The Logan Sapphire brooch, [[National Museum of Natural History]], Washington, D.C.]]▼
{{Short description|423-carat blue sapphire}}
▲[[File:Logan Sapphire
The '''Logan Sapphire''' is a {{convert|422.98|carat|g|adj=on|lk=in}} [[sapphire]] from [[Sri Lanka]].
==Description==
The Logan Sapphire weighs {{convert|422.98|carat|g|lk=in}} and is approximately the size of a large chicken egg, measuring {{convert|49.23 x 38.26 x 20.56|mm|in|abbr=on}}.<ref name="feather" /><ref name="unearthed" /> It is a mixed cushion-cut [[sapphire]] (having a rounded rectangular shape) and is blue with slight shades of violet.<ref name="website" /><ref name="dictionary">{{cite book |last=Manutchehr-Danai |first=Mohsen |year=2013 |chapter=Cushion cut |title=Dictionary of Gems and Gemology |publisher=[[Springer Science+Business Media]] |page=80, 120 |isbn=978-3-662-04288-5 |oclc=851374055}}</ref> The cut is designed to highlight its color rather than to improve its [[brilliance (gemstone)|brilliance]].<ref>{{cite book |last=O'Neil |first=Paul |year=1983 |title=Gemstones |url=https://archive.org/details/gemstones00onei/mode/2up |url-access=registration |publisher=[[Time Life]] |page=86 |isbn=978-0-8094-4500-4 |oclc=1033664759}}</ref> In
The Logan
==History==
[[File:Natural History Museum - Logan Sapphire (2).jpg|right|thumb|upright|alt=The Logan Sapphire brooch on a display stand|The Logan Sapphire on display]]
The sapphire was mined from
In the early 1950s, the American diplomat [[M. Robert Guggenheim]] purchased the sapphire from Sassoon.
Rebecca Guggenheim changed her surname to Logan in 1962 after
==See also==
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[[Category:Individual brooches]]
[[Category:Individual sapphires]]
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