Nautilus shell in the context of Nacre


Nautilus shell in the context of Nacre

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⭐ Core Definition: Nautilus shell

The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This is to help avoid predators, because when seen from above, it blends in with the darkness of the sea, and when seen from below, it blends in with the light coming from above.

The range of the chambered nautilus encompasses much of the south Pacific; It has been found near reefs and on the seafloor off the coasts of Australia, Japan, and Micronesia.

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Nautilus shell in the context of Silver-gilt

Silver-gilt or gilded/gilt silver, sometimes known in American English by the French term vermeil, is silver (either pure or sterling) which has been gilded. Most large objects made in goldsmithing that appear to be gold are actually silver-gilt; for example, most sporting trophies (including medals such as the gold medals awarded in all Olympic Games after 1912) and many crown jewels are silver-gilt objects.

Apart from the raw materials being much less expensive to acquire than solid gold of any karat, large silver-gilt objects are also noticeably lighter, as well as more durable. (Gold is about 1.7× heavier than lead and 1.8× heavier than silver and is easily scratched and bent.) For objects that have intricate detail such as monstrances, gilding greatly reduces the need for cleaning and polishing, and so reduces the risk of damage. Ungilded silver would suffer oxidation and need frequent polishing; gold does not oxidize at all. The "gold" threads used in embroidered goldwork are normally also silver-gilt.

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Nautilus shell in the context of Burghley Nef

The Burghley Nef is a parcel-gilt salt cellar made in Paris in 1527–28 (or possibly earlier). It is in the form of a late medieval ship, the hull made from a nautilus shell. The ship sits on the back of a mermaid on an hexagonal base. The height is 34.8 centimetres (13.7 in).

In medieval France the word nef was applied to various types of boat-shaped containers, including the most magnificent objects intended for the dining tables and buffets of the rich. Apart from having an obvious ornamental quality, their function was to hold personal pieces of cutlery or, as in this case, salt or spices—there is a detachable compartment on the rear deck, which was presumably passed around the table. This nautilus shell was a rare natural curiosity.

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