What is the fine-grained topic of the following text: Van Cleef & Arpels actually brought in an experienced French cabinet-maker/inlayer to carve out the motifs used in this necklace, and he did so using antique machinery which had been used to cut Boulle marquetry back in the times of Louis XIV. Only return the topic.
Creation process of a Van Cleef & Arpels necklace