Costume jewelry is all well and good (it makes up a good 95% of our jewelry boxes, personally), but there's nothing like the true sparkle of real tanzanite or other semi-precious and precious gemstones, is there? Shop for a treat at Jewelry Television , because through tomorrow, they're hosting a 48 hour secret sale where you can save an extra 25% on over 1,000 items with coupon code DISCIPGEM7. Shop for loose gemstones, jewelry, jewelry making supplies, settings, and more. Coupon expires 07/28/2011.