hardness 9 0 sapphire optical ring

{"cid":"91191224","title":"Hardness 9.0 Sapphire Components Sapphire Optical Ring Glass High Temperature Abrasion Resistance","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/9d\/16\/35546d0c50a8ed9d2f0b8e548b20-200x200-1.jpg","attrs":{"Price":"by case","Brand Name":"zmkj","Model Number":"sapphire ring lens","Minimum Order Quantity":"5pcs","Delivery Time":"1-3weeks","Place of Origin":"CHINA","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"50000pcs per month","Packaging Details":"packed in Capacitor paper +Sponge paper+paper case","material":"sapphire optical grade","Orientation":"C-axis","Surface S\/D":"polished","Tolerance":"\u00b10.03mm","application":"rolling bearing components","grade":"optical grade without bubble;color","hardness":"9.0","advantage":"high temperature, high pressure, high-temperature abrasion resistance"}}

{"cid":"91221799","title":"Diameter 290mm Sapphire Optical Ring Hardness 9.0 Sapphire Single Crystal","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/09\/60\/267869382f6e360f73b24331cff7-200x200-1.jpg","attrs":{"Brand Name":"Jingjing","Minimum Order Quantity":"10 pcs","Delivery Time":"1-4 weeks","Place of Origin":"China","Payment Terms":"T\/T,Western Union,","Supply Ability":"100000 pcs\/Month","Packaging Details":"packed in Capacitor paper +Sponge paper+paper case","Certification":"ISO9001","Material":"Optical sapphire","Hardness Mohs":"9","Purity":"99.999%","Density":"3.98g\/cm\u00b3","Melting point":"2045\u2103","Tolerance":"\u00b10.03mm","Parallelism":"\u22643 ARC Min","Chamfer":"0.1-0.3mm*45\u00b0","Surface":"Fine Grinding","Roughness":"1.0\u03bcm"}}