When it comes to jade offering trusted jewellery Singapore, you should rest assured that only jadeite jade and nephrite jade are deemed to be authentic jade. The jadeite jade would be slightly harder. It would take glossy polish for bringing it to desired appearance. It would be gray, orange, green, yellow, lavender, or white. The criteria for determining jadeite jade would be same as gemstone.
On the other hand, the nephrite jade would be slightly less hard than jadeite jade, but harder than normal steel knife. These would be important characteristics to help you determine quality of jade jewellery before you invest in it.