search
  • 登录
    注册
  • 只提供英语客户支持

    免费通话 - 仅限美国和加拿大:
    1-800-464-1640

    国际:
    +66-39303404

  • Change Language
  • USD

Gemstone Testers

Wouldn't it be wonderful if there were a simple to use and inexpensive machine that anyone could use to reliably identify gemstones? One that could distinguish real gems from synthetics and tell you whether your green stone is an emerald, a peridot, a demantoid garnet or just a piece of glass. It would be especially nice if the machine could tell you whether the stone had been heat treated or irradiated. Of course, such a machine should be able to this without damaging the gemstone in any way.

Diamond Tester
Diamond Tester

Unfortunately such a machine doesn't yet exist, and perhaps it never will. But there have been interesting attempts to develop one. There are now some useful devices on the market, though not yet one that can replace the judgement of a trained gemologist using traditional tools.

The best attempt so far to design such a device is a diamond tester, which was first used to distinguish diamond from cubic zirconia. Newer versions of these testers can also identify synthetic moissanite.

Since these testers work reasonably well on diamonds, there have been attempts to apply the same technology to colored gemstones. They are somewhat useful, but have limitations. Nonetheless, they are starting to be adopted in the trade.

Duo Gemstone Tester
Duo Gemstone Tester

These devices work by testing for thermal conductivity of the material. Diamond is an unusual material, because it has an especially high thermal conductivity. In fact it conducts heat five times better than the next best heat conductor, silver. That's the reason behind one of the oldest tests for diamond. If you take a diamond at room temperature and touch it against your upper lip, it will feel icy cold. That's because the diamond is conducting heat away from your body.

Cubic zirconia has a much lower level of thermal conductivity than diamond, so it was relatively easy to develop a tester to tell them apart. But when moissanite first came on the market, it fooled all the thermal conductivity testers, since moissanite also conducts heat very well. A different test for electrical conductivity had to be incorporated into a new generation of diamond testers.

In the world of colored gemstones, current testers on the market can distinguish sapphire from tanzanite, iolite, spinel, citrine, topaz and tourmaline; and distinguish ruby from spinel and garnet. They can also separate emerald from jadeite and garnet; and distinguish topaz from aquamarine, amethyst and citrine. They can reliably tell you if your putative gemstone is glass, even if they can't always tell you what kind of gemstone it is. To date, no electronic tester even attempts to diagnose gem treatments. Gemologists have no reason yet to fear for their jobs.

  • 首次发布于: July-24-2008
  • 最后更新于:: January-22-2019
  • © 2005-2021 GemSelect.com版权所有。
    未经GemSelect.com(SETT Company Ltd.)的书面同意,严格禁止复制(文字或图形)。.
More Shapes
人气宝石
  • 蓝宝石
  • 祖母绿
  • 红宝石
  • 海蓝宝
  • 锆石
  • 蛋白石
  • 黄玉
  • 碧玺
  • 石榴石
  • 紫水晶
  • 黄水晶
  • 坦桑黝帘石
全部宝石 (143)
C D G H N P Q S
  • Cat's Eye Opal
  • Druzy Amethyst
  • Grandidierite
  • Hyalite Opal
  • Nuummite
  • Pyrite
  • Quartz With Marcasite
  • Scolecite
  • Spectrolite
  • 中长石拉长
  • 卢比莱碧玺
  • 变色宝石
  • 变色水铝石
  • 变色石榴石
  • 变色萤石
  • 变色蓝宝石
  • 坦桑黝帘石
  • 堇青石
  • 天河石
  • 孔雀石
  • 尖晶石
  • 巧克力蛋白石
  • 帝王黄玉
  • 异极矿晶簇
  • 彩虹月长石
  • 彩虹黄铁矿
  • 彼得石
  • 拉利玛
  • 拉长石
  • 摩西西
  • 斑彩石
  • 斑晶蛋白石
  • 斜硅镁石
  • 方柱石
  • 方解石
  • 方钠石
  • 日光石
  • 星光宝石
  • 星光日长石
  • 星光月长石
  • 星光柠檬石英
  • 星光石榴石
  • 星光粉晶
  • 星光红宝石
  • 星光蓝宝石
  • 星光透辉石
  • 月光石猫眼
  • 月长石
  • 杉石
  • 枝状玛瑙
  • 查罗石
  • 榍石
  • 橄榄石
  • 沙弗莱石榴石
  • 海蓝宝
  • 火玛瑙
  • 火蛋白石
  • 烟晶
  • 猫眼宝石
  • 猫眼方柱石
  • 猫眼海蓝宝石
  • 猫眼磷灰石
  • 玉宝石
  • 玉髓
  • 玛瑙
  • 玛瑙晶洞
  • 珊瑚
  • 珊瑚化石
  • 珍珠
  • 珍珠母
  • 电镀黄玉
  • 石榴石
  • 石英
  • 石英猫眼
  • 砂金石
  • 砾背蛋白石
  • 硅孔雀石
  • 硅硼钙石
  • 硅线石
  • 硅线石猫眼
  • 碧玉
  • 碧玺
  • 磷灰石
  • 磷鋁石
  • 祖母绿
  • 符山石
  • 紅寶黝簾石
  • 紫水晶
  • 紫锂辉石
  • 紫黄晶
  • 红宝石
  • 红柱石
  • 红榴石
  • 红玉髓
  • 红纹石
  • 绿松石
  • 绿玉髓
  • 绿龙晶
  • 缟玛瑙
  • 翠绿锂辉石
  • 翡翠
  • 芙蓉石
  • 草莓石英
  • 菱锌矿
  • 萤石
  • 葡萄石
  • 蓝宝石
  • 蓝晶石
  • 蓝铜矿晶
  • 虎眼石
  • 虎眼石斑晶
  • 蛇纹石
  • 蛋白石
  • 蛋白石二层石
  • 血石
  • 赤铁矿
  • 金发晶
  • 金绿柱石
  • 金绿玉
  • 钙铁榴石
  • 钙铝榴石
  • 钙铝榴石
  • 钠柱晶石
  • 钻石
  • 铁铝榴石
  • 铬云母红宝石
  • 铬透辉石
  • 铯绿柱石
  • 锆石
  • 锰铝榴石
  • 镁铝榴石
  • 闪锌矿
  • 阳起石猫眼
  • 雪花黑曜石
  • 青金石
  • 顽辉石
  • 马拉亚石榴石
  • 马里石榴石
  • 鹰眼石
  • 黄水晶
  • 黄玉
  • 黑曜石
  • 黑蛋白石
Main Categories
  • 新品
  • 批量宝石
  • 标准化宝石
  • Gemstones By Piece
  • 高档宝石
  • 匹配的成对宝石
  • 凸面宝石
  • Drilled Gems, Briolettes and Beads
  • 诞生石
  • 宝石雕刻
  • 别致的宝石
  • 星光宝石
  • 未经加热处理的蓝宝石
只提供英语客户支持

免费通话 - 仅限美国和加拿大:
1-800-464-1640

国际:
+66-39303404

省钱
其他商品不收取额外的运费!
8.90美元全球发货

Update Translation
 
Current Value
New Value
GemSelect Gemstones
X 关闭窗口
Colored Gemstones
X 关闭窗口
Colored Gemstones
X 关闭窗口
Colored Gemstones
大小和重量

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart