description | Colored gem testing, including origin and treatment identification for ruby, sapphire, spinel, emerald and jade from Lotus Gemology |
keywords |
gem testing,ruby,sapphire,gemology,precious stones,gems,Burmese ruby,spinel,jade,jadeite,Kashmir sapphire,Burma sapphire,emerald |
update time | 2020-09-15 09:04:06 |