WorkVenture gives you an inside look at what it's like to work at ALPHA DIAMOND TOOLS CO., LTD., office & team photos, reviews and more. This is the ALPHA DIAMOND TOOLS CO., LTD. Company Page. All content is posted anonymously by employees currently or previously working at ALPHA DIAMOND TOOLS CO., LTD..Apply to InoueApply to Neo DigitalApply to Business ServiceApply to CPL