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38 40 India 44 Borneo 46 Brazil 49 South Africa 57 Namibia 58 Democratic Republic of the Congo (DRC) 59 Angola 60 Sierra Leone 61 Tanzania 62 Botswana 64 Zimbabwe 64 Lesotho 66 USA 67 Russia 72 Australia 74 Canada Chapter 3: Diamond Mining and Processing
Gas fired melting furnace for A shape crucible
Packaged in corrosion-resistant paper to maintain sharpness and quality
Presidium Gem Tester II – Identify Diamonds & Colored Gemstones with Confidence
advanced identification methods and tips on gem care are included along with diagrams and tables to aid in identification and evaluation
Twist drill - Carbide - Busch - Fig. 4203 Ringtools 38 40 India 44 BorneoPrice per piece. 1 pack = 2pcs 4203 CARBIDE twist drill Material: Finest grain carbide rang of app.: corals , pearls shank: 2. 35mm dia rec. speed: 5,000 9,000 r. p. m. (free hand drilling) 8,000 14,000 r. p. m. (upright drilling) advantage: durable, very solid safe
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