Barbara Bixby Blue Topaz Key Enhancer SS/18K. Oval shape London Blue Topaz is approximately 0.50 carat. Oxidized finish. Measures about 1-7/8"L x 5/8"W. Stock photo. Payment is due in 3 calendar days after the auction ends.Contiguous US, Alaska, Hawaii shipping only. Illinois shipping addresses pay sales tax. All sales for the listings are final. See details. Expect variations due to handcrafting.