Gemstone Type: Tanzanite Gemstone Color: Violet-Blue Gemstone Shape: Oval Country of Origin: Tanzania Transparency: SI1 Condition: Small chipped, crack Size (mm): 6.0 x 5.5 x 3.5 Weight (ct): 0.87 Treatment: Gentle heat Effect:
Gemstone Type: Spinel Gemstone Color: Purple-Blue Gemstone Shape: Oval Country of Origin: Myanmar Transparency: SI1 Condition: Small chipped Size (mm): 5.7 x 4.5 x 3.0 Weight (ct): 0.61 Treatment: Effect:
Gemstone Type: Apatite Gemstone Color: Green-Yellow Gemstone Shape: Baguette Country of Origin: Madagascar Transparency: VS Condition: Size (mm): 8.0 x 4.0 x 2.7 Weight (ct): 0.84 Treatment: Effect:
Gemstone Type: Opal Gemstone Color: Black Gemstone Shape: Pear Cabochon Country of Origin: Ethiopia Transparency: Translucent Condition: Size (mm): 8.0 x 5.0 x 2.8 Weight (ct): 0.56 Treatment: Smoked Effect: Play of color
Gemstone Type: Topaz Gemstone Color: Sky Blue Gemstone Shape: Pear Country of Origin: Africa Transparency: VVS Condition: Small chipped Size (mm): 10.0 x 7.0 x 4.5 Weight (ct): 2.38 Treatment: Irradiation Effect:
Gemstone Type: Opal Gemstone Color: Black Gemstone Shape: Oval Cabochon Country of Origin: Ethiopia Transparency: Opaque Condition: Size (mm): 10.0 x 8.0 x 6.2 Weight (ct): 2.41 Treatment: Effect: Play of color
Gemstone Type: Opal Gemstone Color: Yellow Gemstone Shape: Trillion Country of Origin: Ethiopia Transparency: SI1 Condition: Size (mm): 11.8 x 8.8 x 5.0 Weight (ct): 2.03 Treatment: Effect:
Gemstone Type: Opal Gemstone Color: Clear Gemstone Shape: Oval Country of Origin: Ethiopia Transparency: SI1 Condition: Size (mm): 7.0 x 5.0 x 3.4 Weight (ct): 0.49 Treatment: Effect: Play of color
Gemstone Type: Aquamarine Gemstone Color: Blue Gemstone Shape: Octagon Country of Origin: Africa Transparency: VVS Condition: Size (mm): 4.5 x 4.5 x 1.8 Weight (ct): 0.26 Treatment: Effect:
Gemstone Type: Sapphire Gemstone Color: Blue Gemstone Shape: Pear Country of Origin: Ceylon Transparency: SI1 Condition: Small chipped Size (mm): 9.0 x 6.0 x 3.7 Weight (ct): 1.64 Treatment: Heated (minor residue) Effect:
I’ve been working on trying to understand how the different types of silicon dioxide (SiO2) are named.
This is a presentation I gave to the Ozark Mountain Gem & Mineral Society on 25 April 2022. Please click on the images to view copyright information. 10 Most Deadly Minerals There are dozens of “# (pick a number) Most (insert favorite doom and gloom word here) Mineral” lists available on the internet. Nearly all […]
