SilverSpeck via eBay offers the 0.01-Total Carat Weight Black Diamond Heart Pendant or 0.01-Total Carat Weight Black Diamond Heart Key Necklace for $9.99 with free shipping. That's at least $8 under the lowest total price we could find for similar items elsewhere. Each features one genuine diamond set in a pave pattern and an 18" chain. Deal ends February 20 at 10:58 am ET.