tags: #publish links: [[Gemstone Faceting]] created: 2023-12-03 Sun --- # Subsurface damage depth for each grit size Subsurface damage thickness estimated for each grit size (from [this AttawayGems article](https://www.attawaygems.com/NMFG/cabinet_makers_and_chain_saws.html?fbclid=IwAR2xFOfMZSX7ZUTSe-jtDcPEoxrRc5DocbxXIV3IY2FeoSf1DXrzHJp3tI0)): | Grit size | min thickness, 4x particle size (mm) | max thickness (mm), 10x particle size | 80 1.04 2.6 180 0.34 0.86 220 0.24 0.60 325 0.12 0.30 600 0.06 0.16 1200 0.03 0.07 3000 0.01 0.03