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Product Name: Hat Gemstone Temperature-Sensitive Color-Changing Ring Gemstone size: 1cm Hat size: 1.6cm The weight of the entire ring: approximately 3.4g Ring size: Adjustable open ring, minimum size 17cm, maximum size is unlimited Color change principle: The color changes with the temperature, being black below 14 degrees, and changing to different colors between 14-37 degrees Please see the image below for details. More specific colors require personal experience; the image is for reference only Precautions: 1. The ring design can withstand a dry temperature range of 0-38 degrees Avoid exceeding the maximum temperature set for the ring, as exceeding it will damage the color-changing material 2. Avoid exposing the hot water to the color-changing surface, as it is a resin-coated cover and will be damaged by high temperatures At the same time, it will produce thermal expansion and contraction effects, which can cause damage from air or water ingress 3. Try to avoid bumps and falls;