Track Page Views With Auctiva's FREE Counter Ade Advance Optics Ruby filter for Gem Testing A Ruby Filter, is a small device that you look through to aid in the identification of gemstones, in particular to spot real rubies amongst gemstones that are not rubies, or vice versa. Ade Advanced Optics is an oregon company, who is a current vender/suppiler for GIA. Specifications: Filter Diameter: 20mm Body: Made of heavy metal Lens: Advanced Optic Glass, the retail stores sell this level of glasses for twice of our price. Don't settle with China seller's $14.99 plastic filters. Ours are made from with REAL optical lens w ith durable aluminum body. The cheap plastic filter will not give the accurate result for you need. Payments are accepted through Paypal. Our goal is to place a profit margin of $1 ~ $3 per item and sell in volume. As such, the more you save the more we make. While the others are selling 1 item, we are selling 10 ~ 20 items due to our price reduction. We ship through USPS First Class Mail. It usually deliver in 2-5 days. International: We charge the same shipping cost to all our customers worldwide(same shipping cost worldwide). Our default shipping is United State Postal Service First Class mail, it take 10-20 business days for delivery. we also offer faster shipping EMS which take 3-6 days. Handing time: 1 business day. For payment received before 14:00PDT, it will ship in the same day. We do Combined Shipment on any multiple purchases. We are pleased to grant a20% discount on the shipping cost of purchases more than item. Please feel free to contact us for discounted shipping costs when you buy multiple items from us. We promise our best quality and the lowest price for our customers. If you are not satisfied with your purchase, you can simply return it for us full refund in 30 days. Please use the "Ask Seller A Question" button. Please allow up to 24 hours for a response. Usually the buyer will get response in 6 hours.