natural gemstone造句

• But, they add, an untreated natural gemstone would most likely be worth more.
• In the case of single-crystal materials, such as natural gemstones, anisotropy in the surface energy leads to faceting.
• Natural gemstones used to produce diamond knives are usually pale yellow, of regular crystal structure and of the greatest possible purity.
• Druse, also known as drusy or druzy, is used with a variety of natural gemstones including agate, crystallline quartz and many more.
• Generally, it is possible to find drusy natural gemstones in any location in which there is a place for water to collect and evaporate on rock.
• Certain synthetic color-change sapphires have a similar color change to the natural gemstone alexandrite and they are sometimes marketed as " alexandrium " or " synthetic alexandrite ".
• Using stones that are of relatively uniform color and texture ( typically pre-cut natural gemstones such as jasper, marble, or amethyst ), the resulting mosaics have a uniquely ethereal quality that distinguishes them from traditional processes.
• "' Fire agate "', a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States ( New Mexico, Arizona and California ).
• Here artisans are making blue pottery, weaving, tie dyeing, block printing, making paper, inlaying brass and re-creating famous miniature paintings on 200-year-old paper with paints made as they were in the past, from the scrapings of natural gemstones.
• The Swarovski Group includes Tyrolit ( makers of abrasive and cutting tools ); Swareflex ( reflective and luminous road markings ); Signity ( synthetic and natural gemstones ); and Swarovski Optik ( optical instruments such as binoculars and rifle scopes ).
• However, although this filter is unable to predictably discriminate between natural and synthetic emerald, it has been subsequently found capable of distinguishing aquamarine, blue topaz, and their blue synthetic spinel simulants, because unlike natural gemstones, blue cobalt-containing synthetic spinels emit a red fluorescence under white light.