Star Wars: A Flicker of Hope
A modification generally allowed only to high-ranking members of the Jedi Order, electrum detailing is usually a prestigious honor bestowed upon Jedi Masters as a sign of their rank and skill. A purely cosmetic accessory, electrum detail decorates the lightsaber handle with the rare metal electrum, giving it a distinctive gold color. Though electrum detail does not modify the mechanics of the lightsaber in any way, having a lightsaber with electrum detail grants favorable circumstances on Persuasion checks against all targets familiar with the electrum detail tradition.
Source: Jedi Academy Training Manual, p. 58