| Agate Blue, Green White | Dyed or heated to improve color Dyed or heated to improve color | Exposure to heat or light over time may cause color to fade.
Normal gemstone care |
Alexandrite | None | Normal gemstone care |
Amazonite | Heated, irradiated, impregnated with colorless plastic | Do not use ultrasonic cleaner or steamer. Avoid intense heat and household chemicals. |
| Amethyst Pink, Purple & Green | Heated to improve appearance or lighten color. | Normal gemstone care |
Aquamarine | Heated to improve color and clarity. | Normal gemstone care |
Aventurine | Dyed to enhance color | Normal gemstone care |
Calcite | Dyed, impregnated with colorless plastic | Avoid intense heat and household chemicals. |
Charoite | None | Avoid heat, chemicals & ultrasonic cleaners. |
Citrine | Heated to improve color | Normal gemstone care |
| Cultured Pearl Akoya, Freshwater, Keshi, South Sea, Tahitian | Bleached and polished to achieve uniform color and shape. Dyed or irradiated to produce various colors. Coated for protection. | Avoid contact with cosmetics, hair spray, perfume and household chemicals including alcohol and solvents. Clean with a soft cloth. Do not use ultrasonic cleaner or steamer. |
| Diamond White Black Colored Brown, Champagne, and Yellow Blue | None Heated to create color None
Heated or irradiated | Normal gemstone care Normal gemstone care Normal gemstone care
Normal gemstone care |
| Emerald | Penetrated with oil, wax or clear resin to improve clarity and durability. Dyed with color agents. | Clean with warm soapy water and a soft brush or cloth. Avoid sudden temperature changes, rough handling, steaming and contact with cosmetics, hair spray, and household chemicals including alcohol and solvents. Do not use an ultrasonic cleaner. |
Garnet | None | Normal gemstone care |
Hematite | None | Normal gemstone care |
Iolite | None | Normal gemstone care |
| Jade Jadeite, Nephrite | Bleached, dyed and surface polished with a colorless wax. | Do not use ultrasonic cleaner or steamer. Avoid intense heat and household chemicals. |
| Jasper | Dyed | Normal gemstone care. |
| Kyanite | Heated | Do not use ultrasonic cleaner or steamer. Avoid intense heat and household chemicals. |
| Lab Created | None | Normal gemstone care |
| Lapis Lazuli | Dyed to improve color uniformity. Coated with colorless wax and surface polished. | Clean with warm soapy water and a soft brush or cloth. Do not use ultrasonic cleaner or steamer. Avoid intense heat and household chemicals. |
| Moissanite | None | Normal Gemstone Care |
| Malachite | Coated with colorless wax to improve surface uniformity. | Do not use an ultrasonic cleaner. Avoid household chemicals. |
| Morganite | Heated or irradiated to enhance color | Normal gemstone care |
| Opal | Fused together with backing to create a unique design or color combination. | Do not use ultrasonic cleaner or steamer. Avoid intense heat, cosmetics, and household chemicals. Clean with warm soapy water and a soft brush or cloth. |
| Onyx Black | Dyed or heated to improve color. | Normal gemstone care. |
| Peridot | None | Avoid sudden temperature changes and ultrasonic. |
| Quartz Green Prasiolite, Lemon, Lime, Pink, Rose, Silver, Smoky, White | Heated or irradiated to enhance color. | Normal gemstone care |
| Quartzite | Dyed, impregnated with colorless plastic | Normal gemstone care |
| Rhodochrosite | None | Normal gemstone care |
| Rhodonite | None | Normal gemstone care |
| Ruby | Heated to improve color. Fissures and cavities can be filled with foreign material including glass, lead-glass, and glass-like substances to improve clarity. Can be diffused or irradiated to improve color. | Clean with warm soapy water and a soft brush or cloth. Avoid strong detergents and household chemicals including alcohol and solvents. Sensitive to intense heat, pressure and ultrasonic. Avoid re-polishing or re-cutting. |
| Sapphire | Heated to improve color and clarity. Can be diffused and irradiated to produce a variety of colors. | Clean with warm soapy water and a soft brush or cloth. Avoid strong detergents and ultrasonic. Avoid re-polishing or re-cutting. |
| Sodalite | Dyed | Do not use ultrasonic cleaner or steamer. Avoid intense heat and household chemicals. |
| Sunstone Oregon | None | Normal gemstone care |
| Tanzanite | Heated to improve color | Clean with warm soapy water and a soft brush or cloth. Do not use ultrasonic cleaner or steamer. Avoid sudden temperature changes. |
| Tiger's Eye | Heated to improve color | Normal gemstone care. Avoid sudden temperature changes. |
| Topaz Blue, Pink, White Mystic | Irradiated and heated to produce color.
Coated to generate iridescence | Clean with warm soapy water and a soft brush or cloth.
Clean with warm soapy water and a soft brush or cloth. Avoid re-polishing or re-cutting. |
| Tourmaline Green Red, Pink | Heated to improve appearance. Surface fissures can be filled with oil or resin. Heated and irradiated to improve color. | Clean with warm soapy water and a soft brush or cloth. Avoid sudden temperature changes. Do not use an ultrasonic cleaner or steamer.
Clean with warm soapy water and a soft brush or cloth. Avoid sudden temperature changes and steaming. |
| Tsavorite | None | Normal gemstone care |
| Turquoise | Permeated with plastic or coated with wax or colorless oil. Dyed to improve color. | Clean with warm soapy water and a soft brush or cloth. Do not use ultrasonic cleaner or steamer. Avoid contact with cosmetics, hair spray, perfume and household chemicals including acids. Avoid intense heat. |
| Varisite | Impregnated with colorless plastic | Avoid harsh abrasives. |
| Zircon Blue | Heated to improve color and intensity | Avoid ultrasonic cleaning and harsh abrasives. |