Exodus 28:12-22

12 and fasten them on the shoulder straps of the ephod as reminders of who the Israelites are. In this way Aaron will carry their names on his shoulders as a reminder in the LORD's presence.
13 Make gold settings
14 and two chains of pure gold, twisted like ropes, and fasten these chains to the settings.
15 "Make the breastplate for decision-making as creatively as you make the ephod. Make it out of gold, violet, purple, and bright red yarn and out of fine linen yarn.
16 Fold it in half so that it's 9 inches square.
17 Fasten four rows of precious stones on it. In the first row put red quartz, topaz, and emerald.
18 In the second row put turquoise, sapphire, and crystal.
19 In the third row put jacinth, agate, and amethyst.
20 In the fourth row put beryl, onyx, and gray quartz. Mount them in gold settings.
21 The stones correspond to the 12 sons of Israel, by name, each stone engraved (like a signet ring) with the name of one of the 12 tribes.
22 "For the breastplate make chains out of pure gold, twisted like ropes.