鉴定证书

彩色宝石证书

IGI 彩色宝石证书基于精确的宝石分析，用于鉴定彩色宝石的类别与种类。

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彩色宝石证书

11月 XXXXX

November *****

IGI报告编号

IGI Report Number

宝石种类: 天然刚玉

Species

NATURAL CORUNDUM

宝石名称: 蓝宝石

Variety

SAPPHIRE

形状和切工: 椭圆形混合切

Shape and Cutting Style

OVAL MIXED CUT

重量: 4.36克拉

Weight

4.36 CARATS

尺寸: 9.93✖️7.93✖️6.03 mm

Measurements

9.93 X 7.93 X 6.03mm

颜色和透明度:艳蓝和透明

Color and Transparency

VIVID BLUE,TRANSPARENT

特征: 天然包裹体形态无热处理痕迹

Characteristics

NATURAL INCLUSION(s) PATTERN.NO INDICATIONS OF HEATING

产地: 克什米尔

Country of Origin

KASHMIR

备注：在市场贸易中，可将此颜色称为“矢车菊蓝”

Comments:

This color can be called "Cornflower Blue" as trade term in the market

宝石种类和宝石名称

Species & Variety

根据宝石的基本化学成分和晶体结构，可以细分成不同种类；在一个特定的种类中，由于化学组成的轻微不同，可能会导致不同的颜色或种类。

光与宝石相互作用的方式，可能在不同的宝石种类里，呈现出不同形式的惊人光学现象，例如星光、猫眼效应或变色。

Gems may be classified in different species,according to their basic chemical composition and crystal structure;

the way that light interacts with the gem may create some astonishing optical phenomena such as a star,a cat's eye effect or change of color,in different varieties

透明度

Transparency

随着光线在宝石中传播，部分光线（如果不是全部）会被吸收，部分会透射出去。光线被吸收的越多，石头的透明度越低。

As light passes through a gemstone,part of it,if not all,will e absorbed,and part will be transmitted the more light that is absorbed the less transparent the stone will be.

特征

Characteristics

对宝石来说，内部特征就是它们的指纹。宝石内部特征不仅提供了有关矿物形成时的重要信息，而且还在判别产地时提供了可能的地质或地理区域的相关信息。

Internal characteristics are the fingerprint of a gemstone. Not only do they provide essential information about the formation, but also the possible geological and geographical region where they originated from.Sometimes they also provide information about whether the gemstone has been treated.

折射率

Refractive Index

当光线先在空气中传播，然后进入一颗彩色宝石中，光线传播的速度会下降，因为传播媒介的不同。光线在空气中传播的速度，与在其他介质中传播速度的比值，就是双折射率。

When light passes through air and enters a gemstone it slows down due to a difference in the medium. as The ratio between the speed of light in air and in a particular medium is known the Refractive Index.

光学特征

Optic Character

决定了光线是如何在晶体中传播的。利用一系列特殊仪器，能够判别一颗石头是均质体还是非均质体，一轴晶还是二轴晶。

Determining how light travels through the crystal. Using a range of specialized instruments, we will be able to establish if the stone is isotropic or anisotopic,uniaxial or biaxial.

比重

Specific Gravity

比重是一个比值，用宝石在空气中的密度比上宝石在同等体积水中的密度。

Specific gravity is the ratio of the density of the gemstone to the density of an equal volume of water.

所有的IGI实验室都在使用各种各样的最先进的仪器，像傅立叶变换红外光谱仪（FTIR）和拉曼光谱仪，对于不同的宝石都能给出
相对应的独特图像。这些图像可以揭露一颗宝石的种类、处理，有时候，甚至是产地。

All IGI Laboratories employ a wide range of state of the art equipent,like FTIRand Raman spectrometers,all of which give a unique spectral grap for different gemstones. They can reveal the species of the gemstone,treatments and, at times,even the geographic origin.

光学性质和物理性质

OPTICAL and PHYSICAL PROPERTIES

折射率

Refractive Index

1.762 - 1.770

双折射率

Birefringence

0.008

光性特征：一轴晶

Optic Character

UNIAXIAL

光性符号：负光性