TREATMENT (Enhancement): Any human-controlled process, beyond cutting and polishing, that improves the appearance, durability, or value of a gem.
The list of popular gems routinely treated includesamethyst,aquamarine, chalcedony, citrine, emerald, jade, lapis lazuli, opal, pearl,ruby, sapphire, tanzanite, tiger’s-eye, topaz, turquoise, and zircon.
| Ruby is one of the gems that are routinely treated, there are over 90% of rubies in the trade are treated. | |
| The common enhancement of rubies are: | |
 Heat treatment | |
 Fracture Filling | |
| Lattice diffusion |
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| Lead glass fracture-filled rubies |
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