How to know the real Jade stone .. 

I have black obsidian Glassy, sharp when in raw form, hardness is 5.5-6.0, when under bright light it looks pale brown or yellow/yellowish

I won't try this method because fire is harmful even to authentic crystals, they may crack fade or split

the hair means human hairs or nylon hair

"Jade" is either nephrite or jadeite Nephrite is dark earthy green with black spots inside. Jadeite has many colors but the green one is spinach green and has veiny fibers inside Nephrite is more common and not very expensive. Its used since ancient times for carvings Jadeite is very rare and very expensive. Gem quality jadeite is six digits to millions per stone

Meron ako

Sibol Crystals

Jade is either nephrite or jadeite Nephrite Jade is more common, and quite affordable Jadeite is very rare and very expensive, six digits to millions ang gem quality