Following scientific, accurate and fare principle, PKUGAC provides customers with good testing service of gems & jewelry, and undertake corresponding civil legal liabilities. ¡¡ The main testing scope and items are as follows: 1. Diamond: Identification and grading of Diamond 2. Gemstones: Identification of different kinds of gemstones such as Ruby, Sapphire, Chrysoberyl, Cat¡¯s Eye, Alexandrite, Emerald, Aquamarine, Tourmaline, Spinel, Zircon, Topaz, Olivine, Garnet, Rock Cristal, Feldspar, Zoisite, Apatite, Pyroxene and so on. 3. Jades: Jadeite, Nephrite, Opal, Chalcedony(agate), Silicified asbestos, Quartzite, Serpentine, Dushan jade, turquoise, Lapis lazuli, Charoite, Malachite, Marble, Fluorite, Chicken-blood stone, Qingtian Stone, Shoushan Stone, 4. Organic gems: including identification of pearl, amber, coral, ivory, shell, tortoise shell (turtleback), jet, rhinoceros horn etc. 5. Ink stone: identification of different kinds of ink stone 6. Ornamental stones: including identification of different kinds of ornamental stones and their pattern 7. Precious medals: including the composition and purity testing of precious medals such as gold, platinum, silver etc. 8. Artificial Products: including various synthetic gems, artificial gems, plastic, glass etc.