New International VersionAlso in front of the throne there was what looked like a sea of glass, clear as crystal. In the center, around the throne, were four living creatures, and they were covered with eyes, in front and in back.
American Standard Versionand before the throne, as it were a sea of glass like a crystal; and in the midst of the throne, and round about the throne, four living creatures full of eyes before and behind.
Berean Study BibleAnd before the throne was something like a sea of glass, as clear as crystal. In the center, around the throne, were four living creatures, covered with eyes in front and back.
Douay-Rheims BibleAnd in the sight of the throne was, as it were, a sea of glass like to crystal; and in the midst of the throne, and round about the throne, were four living creatures, full of eyes before and behind.
English Revised Versionand before the throne, as it were a glassy sea like unto crystal; and in the midst of the throne, and round about the throne, four living creatures full of eyes before and behind.
King James BibleAnd before the throne
there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne,
were four beasts full of eyes before and behind.
World English BibleBefore the throne was something like a sea of glass, similar to crystal. In the midst of the throne, and around the throne were four living creatures full of eyes before and behind.
Young's Literal Translation and before the throne is a sea of glass like to crystal, and in the midst of the throne, and round the throne, are four living creatures, full of eyes before and behind;
Revelation 4:6 Additional Translations ... 
