EGL Laboratories provide certification to real gemstones by testing each gemstone individually and provide Global Identification Number to each gemstone.
EGL Lab is dealing with around 2000 B2B customers all over the world for the gemstones.
EGL Lab Laboratories is acknowledged to offer legit gemstone certification for the gemstones. It is one of the most trusted brands in the gemstone market which is known to offer a legit certificate for the gemstones.
Hence it is categorically not possible for a jeweler or mostly for many gemstone dealers to provide the legit certification of the stone.
In order to check you may personally, you will see that they have attested certificate with each gemstone with a unique Certificate number.