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

Unusual Star Garnet

Star garnet is an unusual form of garnet. Asterism (the star effect) is associated mostly with star sapphire and star ruby. Actually there are other gemstones that can also exhibit this effect, though specimens are fairly rare. The other star gems include moonstone, quartz, spinel, citrine, diopside, emerald, chrysoberyl and beryl.

Deep Red Star Garnet Gemstone
Deep Red Star Garnet Gemstone

Star garnets are so rare that to date they have only been found in two places in the world; in the state of Idaho in the USA and in India. The garnet varieties that occasionally exhibit asterism are almandine and a mixture of almandine and pyrope garnet.

Star garnet gemstones are usually opaque and deep brownish-red or reddish-black. Like all star gems, the star effect is caused by inclusions of rutile. In order to display the star effect, the rutile needles must have the correct alignment to reflect light in a pattern forming a mult-rayed star.

Star Garnet Gem Rough
Star Garnet Gem Rough

Most star garnets display a 4-rayed star, but 6-rayed stars are sometimes seen. Some gemstone dealers claim that only the Idaho star garnets ever display a 6-rayed star, but this claim is difficult to verify since specimens with 6-rayed stars are very rare.

The people of Idaho are so proud of their star garnet deposits that star garnet has been declared the state gemstone. Star garnets are mined in Northern Idaho in a region that is northeast of Moscow and southeast of Coeur d'Alene.

The star effect in most star garnet gemstones is subtle and requires the correct lighting to be seen clearly. The best lighting is direct sunlight. However, a light source such as a narrow beam halogen spotlight or small flashlight will also work. The star is best seen by standing directly above the stone and looking straight down.

  • 首次发布于: August-15-2008
  • 最后更新于:: November-20-2019
  • © 2005-2020 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 (144)
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