Jewelry Glossary
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Washington Convention
The Washington Convention is officially called "the Convention on International Trade in Endangered Species of Wild Fauna and Flora." From its initials, it is also called CITES. Since it was adopted in Washington DC in the United States (1973), it is also known as the Washington Convention. To prevent the extinction of species by excessive international transactions, wildlife plant species considered necessary to regulate international transactions are listed.
(Here is the link to the page of CITES ⇒ http://www.cites.org/ )
- Washington Convention -
Watermelon Tourmaline
Watermelon tourmaline features two or three colors akin to watermelons. Its color profile is attributed to the uptake of elements that generate various colors such as iron, manganese, titanium and chromium. These elements are absorbed by the stone in order giving the stone its layered appearance in the time difference when crystals grow in nature.
[Moh's hardness: 7] [Mineral species: Tourmaline]Wax Modeling
Processing soft or hard wax with tools produces prototypes used for casting.
White Opal
The body color of white opal is milky white or transparent. A beautiful "play of color" can be seen.
[Moh's hardness: 5] [Mineral species: Opal]
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to see the details of Kyocera's Crescent Vert white opal.
White & Black Opal
White and black opal elicit a mysterious charm with their rich interplay of color. Engineered opal captures the essence of that beauty in shades of blue, green, red and purple swirled together in a dazzling display. Our engineered opals shine brightly, with each color expressing a different personal nuance. Opal’s colors result from light reflected through the stone’s silicon dioxide particles.
Kyocera’s proprietary process creates what nature cannot: Uniformly thick opal stones that won’t split or chip, making them ideal for intricate jewelry designs. Unlike natural opal, Crescent Vert opal and black opal can be easily and precisely cut, achieving what was once impossible in the jewelry world. In addition, Crescent Vert opal is incredibly durable, offering high heat resistance because of its well-balanced internal water content.Available in sizes up to 15 carats.* If you need a larger stone, please contact us.View Comparison Table White Opal Black Opal Item Crescent Vert Opal Natural Opal Crescent Vert Opal Natural Opal Chemical Composition SiO2・nH2O SiO2・nH2O SiO2・nH2O SiO2・nH2O X-ray Diffraction Amorphous Amorphous Amorphous Amorphous Spectroscopic Analysis Same as natural stone Specific absorption of Opal Same as natural stone Specific absorption of Black Opal Crystal system Amorphous Amorphous Amorphous Amorphous Mohs Hardness 5.0～6.5 5.5～6.5 5.0～6.5 5.5～6.5 Specific Gravity 1.90～2.23 1.90～2.20 1.95～2.20 1.98～2.20 Transparency Transparent ～ Translucent Transparent ～ Translucent Translucent ～ Opaque Translucent ～ Opaque Refractive Index 1.440～1.465 1.440～1.465 1.440～1.465 1.435～1.455 Ultraviolet Ray Examination (Long Wavelength)
Dark bluish violet - Inert
(Short Wavelength)
Pale blue - Inert(Long Wavelength)
Strong bluish white - Inert
(Short Wavelength)
Pale blue - Inert(Long Wavelength)
Dark bluish violet - Inert
(Short Wavelength)
Pale blue - Inert(Long Wavelength)
Strong bluish white - Inert
(Short Wavelength)
Pale bluish white - InertSpecial Effect Play of color Play of color Play of color Play of color Wire Necklace
Wire necklace is a simple design that is made with metal wire. The popular length is the choker size.
Work-hardening
A metal is bendable and extendable, but they also have the property of work-hardening, which means that they become harder when subjected to strong external forces.
When extending or bending metal using appropriate equipment, it is usual that platinum and silver alloys that have small vickers hardness will not bend.
Gemstones
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Our specialists are available to answer all inquiries.
