A one-of-a-kind necklace combining 99.99% pure terahertz and natural tanzanite. The metal parts that touch the skin are made of stainless steel 304, and the main body uses nylon-coated stainless steel wire. *This does not guarantee that metal allergies will not occur in everyone. Please refrain from purchasing if you are concerned. As it is a one-of-a-kind item, it is also recommended as a gift. ・The photos are of the actual product. ・Only the necklace will be sent. 　Props such as the display stand are not included. 【Size】 Overall necklace length: Approximately 45cm (±3cm) *Please check each image. 【Shipping Method】 Yu-packet Post Mini (planned) *It may take more than 24 hours for the tracking number to be reflected after the shipping notification. Delivery may take several days, so please purchase with plenty of time. --------------------------------------------------- 【What is Terahertz Stone?】 When touched to ice, it shows a mysterious phenomenon as if it melts in an instant - that is "Terahertz Stone." This stone is said to emit terahertz waves that vibrate approximately 1 trillion times per second. Terahertz stone is not a natural stone, but an artificial stone made from silicon. It is characterized by being very light, making it easy to handle even for those who dislike heavy stones, and is popular as an accessory and healing item. 【What are Terahertz Waves?】 With a frequency range of approximately 1 trillion Hz to 100 trillion Hz and a wavelength range of 3μm to 1000μm, it is a very unique wave that has both the characteristics of light and radio waves. These terahertz waves have the property of penetrating matter and are said to have a "transmission wavelength" that reaches the cellular level of humans. Therefore, it is attracting attention from a wide range of fields around the world, and research is progressing. --------------------------------------------------- *The way colors appear may differ depending on the device you are using. *Because this product is made from processed natural stones, there may be scratches, cracks, chips, dents, and inclusions (internal impurities), which are natural characteristics. Please understand this beforehand.