
1) Boule 2) Buhl 3) Embellishment 4) River Kwai creator 
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https://www.crosswordclues.com/clue/boulle

1) Boule 2) Buhl 
Found on 
https://www.crosswordclues.com/clue/boulle

A marquetry technique, also known as buhl work, using metal, usually brass, and tortoiseshell in reverse patterns, sometimes combined with other materials and often set in an ebony veneer. It was a popular technique in France from the late 17thC through to the 19thC, and in Britain from 1815. The term is associated with the French cabinet-maker and...
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http://www.antique-marks.com/antique-terms-b.html

Type of 
marquetry in brass and tortoiseshell. Originally Italian, it has acquired the name of its most skilful exponent, the French artisan André-Charles Boulle (1642-1732). ...
Found on 
http://www.encyclo.co.uk/local/20688

A MARQUETRY technique, also known as buhl work, using metal (usually brass) and tortoiseshell in reverse patterns, sometimes combined with other materials and often set in an ebony veneer. It was a popular technique in France from the late 17thC through to the 19thC, and in Britain from 1815. The term is associated with the French cabinet-maker and …...
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http://www.encyclo.co.uk/visitor-contributions.php

[
n] - an inlaid furniture decoration
Found on 
http://www.webdictionary.co.uk/definition.php?query=boulle
 boule noun
boule noun an inlaid furniture decoration; tortoiseshell and yellow and white metal form scrolls in cabinetwork
Found on 
https://www.encyclo.co.uk/local/20974

Boulle work, sometimes called boule or buhl, is brilliantly colored and variously composed of wood, brass, tortoiseshell and ivory. The key to boulle designs is their identical but contrasting counter-change effect.
Found on 
https://www.encyclo.co.uk/local/21272

buhl. Also called
Found on 
https://www.infoplease.com/dictionary/boulle
  No exact match found.