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The slab is then trimmed near the marked line using a diamond blade saw—called a trim saw. Diamond-impregnated wheels or silicon carbide wheels can be used to grind the rough rock down. Most lapidary workshops and production facilities have moved away from silicon carbide to diamond grinding wheels or flat lap disks. [citation needed]
Lapidary (from the Latin lapidarius) is the practice of shaping stone, minerals, or gemstones into decorative items such as cabochons, engraved gems (including cameos), and faceted designs. A person who practices lapidary techniques of cutting, grinding, and polishing is known as a lapidary or lapidarist.
In the early 1920s, the Edison Records "Diamond Disc" label–here featuring the popular duo of Billy Jones and Ernest Hare–were intended for playback at 80 rpm. The most common rotational speeds for gramophone records are 33 + 1 ⁄ 3 revolutions per minute (rpm), 45 rpm, and 78 rpm.
The Linear A tablet PH-1 that was originally found by archaeologist Zakarias Iliakis next to the Phaistos Disc [3]. The Phaistos Disc was discovered in the Minoan palace-site of Phaistos, near Hagia Triada, on the south coast of Crete; specifically the disc was found in the basement of room 8 in building 101 of a group of buildings to the northeast of the main palace.
A lapidary is a text in verse or prose, often a whole book, that describes the physical properties and metaphysical virtues of precious and semi-precious stones, that is to say, a work on gemology. [1]
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