Embossed on the (F-Skirt) A single DIAMOND it has a little wire rub in the groove in one spot on the left side. Just take a look at the GRAPHITE that is present in the glass on the left side of the skirt from the wire groove to the lower skirt. The color is a light green.---$10.00--- Buy with confidence! … We do not sell altered insulators! Buyer to pay all shipping and insurance costs (U.S.A. and Canadian shipping only). PayPal, Money Order, or Cashier's Check. Heck, we will even take your personal check if we know you.!!! Don't wait for a sale it's not going to happen.