Exodus 39:12

Overview - Exodus 39
The cloths of service and holy garments.
The ephod.
The breast-plate.
22 The robe of the ephod.
27 The coats, mitre, and girdle of fine linen.
30 The plate of the holy crown.
32 All is finished, reviewed, and approved by Moses.
Treasury of Scripture Knowledge

Exodus 39:12  (King James Version)
And the third row, a ligure, an agate, and an amethyst.

a ligure
{Leshem,} the ligure, the same as the jacinth, or hyacinth, a precious stone of a deep red, with a considerable tinge of yellow. Theophrastus and Pliny say it resembles the carbuncle, of a brightness sparkling like fire.

an agate
{Shevo,} the agate, a semi-pellucid compound gem, formed of different simple minerals, as chalcedony, cornelian, jasper. horn-stone, quartz, amethyst, opal, etc.; joined irregularly or in layers. It is of a white, reddish, yellowish, or greenish ground; and so variously figured in its substance as to represent plants, trees, animals, and other objects.

an amethyst
{Achlamah,} an amethyst, a transparent gem, composed of a strong blue and deep red; and according as either prevails, affording different tinges of purple, sometimes approaching to violet, and sometimes even fading to a pale rose colour.