{"id":5836,"date":"2021-04-08T15:05:09","date_gmt":"2021-04-08T13:05:09","guid":{"rendered":"https:\/\/www.diamondmuseum.com\/?page_id=5836"},"modified":"2021-04-12T13:07:38","modified_gmt":"2021-04-12T11:07:38","slug":"polishing-cap-for-the-rough-cullinan","status":"publish","type":"page","link":"https:\/\/www.diamondmuseum.com\/masterpieces\/polishing-cap-for-the-rough-cullinan\/","title":{"rendered":"Polishing Cap for the rough Cullinan"},"content":{"rendered":"\t\t
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Original polishing cap for the Cullinan<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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To turn a rough diamond into a sparkling stone, machining is required. The main steps of machining are: cleaving, sawing, cutting and polishing. To keep the stone in place during cutting and polishing, an adjuster placed it in a lead cap (holder). It is the former way for securing the diamond. Nowadays, the sharpening tongs are equipped with clamping mechanisms.<\/p>

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In 1907, the Amsterdam firm Asscher was commissioned to cut the rough Cullinan. For this purpose this lead cap was used. In 8 months the stone was cleaved and ground into 9 large and 96 smaller stones. The largest, the flawless Cullinan I of 530.2 carats was mounted as the pear-shaped showpiece in the English king’s scepter.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Original polishing cap for the Cullinan To turn a rough diamond into a sparkling stone, machining is required. The main steps of machining are: cleaving, sawing, cutting and polishing. To keep the stone in place during cutting and polishing, an adjuster placed it in a…<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":504,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5836","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/pages\/5836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/comments?post=5836"}],"version-history":[{"count":10,"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/pages\/5836\/revisions"}],"predecessor-version":[{"id":6049,"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/pages\/5836\/revisions\/6049"}],"up":[{"embeddable":true,"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/pages\/504"}],"wp:attachment":[{"href":"https:\/\/www.diamondmuseum.com\/wp-json\/wp\/v2\/media?parent=5836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}