BLUE TOPAZ 9mm X 7mm Approx 3 Ct.Solitaire Gemstone ready for mounting. NEW

9mm x 7mm Emerald Cut Lt. Blue Topaz, approximately 3 Ct. New, Ready for mounting. Part of a large parcel of Loose Authentic Gemstones, unidentified individually. I really believe by color this is Blue Topaz, but could be Aquamarine. I dont think it is Blue Zircon which has a little different shade. Without specific gem identifying equipment, best guess by visual with color being the primary method. If this is either of the alternate options I gave, the Gemstone would be more valuable than Blue Topaz (December Birthstone) I added a stock pic of 9 x 7 for reference but cushion cut instead of emerald cut.