Alberto Fidalgo

彩色寶石拍賣

ALGT 彩色宝石鉴定报告
鉴定
Species：天然透长石
Variety：坦桑石

描述
形状与切割风格：方形垫型，混合切割
尺寸：11.98 x 11.84 x 7.37 mm
克拉重量：8.43 克拉
颜色：鲜明/深蓝色（偏紫）
透明度：透明

额外等级特征
颜色品质等级：优良颜色品质
产地：坦桑尼亚
产地判定为基于显微观察、光谱特征及化学微量元素分析的专家意见。

备注
坦桑石通常在低温下加热以改善颜色。
目前尚无科学方法可判断此宝石是否经过增进或改良。
测试时晶缝处的净度增强量极小。
净度增强已成为许多宝石贸易中的常见做法，此增强调整可在任何时点逆转。
2026年2月7日
25813759

ALGT COLORED STONE IDENTIFICATION REPORT
IDENTIFICATION
Species ......................................................................................................... Natural Zoisite
Variety ..................................................................................................................... Tanzanite
DESCRIPTION
Shape & Cutting Style ................................................. Square Cushion, Mixed Cut
Measurements .................................................................... 11.98 x 11.84 x 7.37 mm
Carat Weight ...................................................................................................... 8.43 Carat
Color ...................................................................................... Vivid/Deep Blue (Purplish)
Transparency .................................................................................................. Transparent
ADDITIONAL GRADING CHARACTERISTICS
Color Quality Grade .......................................................................... Fine Color Quality
Origin ......................................................................................................................... Tanzania
Origin determination is an expert opinion based on microscopic examination, spectroscopic features and
chemical trace element analysis.
COMMENTS
Tanzanite is commonly heated at low temperature to improve its color.
There is currently no scientific method available to determine whether this
gemstone has been enhanced or not.
Insignificant amount of clarity enhancement in fissures at the time of
testing.
Clarity enhancement has become a common practice in trade for many
gemstones. This enhancement is reversible at any time.
07 February, 2026
25813759

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1 pcs 紫色, 藍色坦桑石 - 8.43 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

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1 pcs 紫色, 藍色 坦桑石 - 8.43 ct - Antwerp Laboratory for Gemstone Testing (ALGT)