what is spinel gemstone

{"cid":"91191224","title":"Gemstone Crystal Jewelry Blue Sapphire Glass Windows Lens Watch Case","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/ba\/45\/bf9ed7b545614909b78cb433a61d-200x200-1.jpg","attrs":{"Price":"by case","Brand Name":"zmkj","Model Number":"ruby plate dia10~dia30mm","Minimum Order Quantity":"3pcs","Delivery Time":"2-4weeks","Place of Origin":"china","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"100pcs\/month","Packaging Details":"customized plastic box","material":"Al2o3 single crystal","type":"doped","color":"blue","growth method":"CZ","application":"watch glass or gem, optical","Material":"color sapphire glass crystal","Use":"LASER SYSTEM","Size":"Customzied,can be customized","Logo":"Customized Logo","Shape":"Customized Shapes","Key Selling Points":"High-accuracy","Chemical formula":"Co2+:MgAl2O4"}}

{"cid":"91220558","title":"Smooth Crystal Loose Bead Strand Silver Obsidian Tourmaline for DIY Crafts Making","imgUrl":"https:\/\/img.silkroadsl.com\/picm\/z20c9acc-200x200-1\/.jpg","attrs":{"Brand Name":"Jane Gems","Model Number":"JANE I-241018","Minimum Order Quantity":"10\/Strands","Delivery Time":"negotiable depend on order quantity","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union","Supply Ability":"10000\/PCS+per month","Packaging Details":"Polybag+Bubble+Carton","Gemstone Material":"Various Polished Smooth Crystal","Product Key words":"Round Shape Sugar Cubes Shape Strand","OEM &ODM Service":"Support Customized Service","Product Packing":"Polybag+Bubble+Carton","Type":"Crystal Polished Smooth Stone Beads","Bead Shape":"Sugar Cubes Shape Crystal Stone","Function":"DIY & Jewelry Making For Gift","Bead Size":"4MM\/8MM \/10MM\/12MM"}}