From the Sotheby's Web site. Also posted to her Subalbum here.
The neckline is hidden by the ruff and ehat little that can be seen could be part of a scoop neckline.
Keywords: 1595, Queen Elizabeth, The Virgin Queen, Gloriana, Good Queen Bess, Tudor family, Queen, English, frizzy coiffure, crown, hair jewelry, necklace, pendant, inner neckline ruff, neckline ruff, outer ruff, fitted bodice, sweetheart décolletage, lace bertha, jeweled puffed sleeves