Fangrui Product Details Fast Identification: Quickly Distinguish Emeralds, , Sapphires, And Aquamarine From Imitations. High-quality Glass: Equipped With A High-quality Glass Filter For Better Clarity And Reduced Distortion. Portable : Heavy-duty Design Ensures Reliability And Easy Transport For On-the-go Gemologists. Simple Operation: User-friendly Design Allows For Easy Use By Holding The Filter Close To The Eye And Examining Stones Under Strong Electric Light. Showcase Compatible: Examine Stones In Showcases Without Needing To Hold The Filter Close To The Stone. Portable And Robust: Designed For Durability And Easy Transportation, For Mobile Gemologists. User-friendly: Simple To Operate; Just Hold It Close To Your Eye And Examine Stones Under Strong Electric Light. Multipurpose Tool: Effective For Identifying A Variety Of Colored Stones, Including Synthetic . Specifications:filter Type: High-quality Glass Filter Light Transmission: Deep Red And Yellow-green Light Usage: Gemstone Identification (emeralds, , Sapphire