are you actually asking how to make meth?
It is not possible to make crystals
Many commercially available crystal roses are made from Swarovski crystal a form of lead glass, itself composed of mainly Quartz. Tutorials on how to make your own crystal glass can be found on the web or bought in a completed form.
Waterford Crystal is brand name, originally it was all made in Waterford. Now though it is very expensive to make high quality glass in a country such as Ireland. It is far cheaper to make in China etc. Waterford Crystal is a brand name not a promise.
a crystal is made due to hexagonal arrangement of molecules
because its made of crystal
Some Waterford Crystal is made in Waterford but not as industrially as before the factory in Waterford closed down. A year or so later the House of Waterford Crystal opened, it makes a bit of the crystal but only really to sell in the store. Frankly it cost to much to make in Ireland with the minimum pay of €1,461.85 a month. It is much cheaper to make in places such as China.
Crystal
No. A crystal garden my be made of crystals but it is no itself a crystal.
Crystal glasses are not made out of crystal. They're made of regular glass in which the calcium is replaced with lead oxide or zinc, causing them to sparkle more than the usual type of glass.
Stuart Crystal in the Carlingford pattern was made between 1955 and 1968.
liquid crystal can be made from plutonium
I can't tell if you mean "crystal" as in "made of a crystalline material" or "crystal" as in "made of lead crystal, which is not technically a crystal at all". Take it to a jeweler. There's not any simple foolproof way a layman could tell.