Electrum was a rare metal once used in lightsaber construction as a sign of Force mastery. This lightsaber modification was called an Electrum Detail or Electrum Detailing. A purely cosmetic accessory, this feature was only allowed to high-ranking Jedi, an honor bestowed on Masters at their promotions, after having demonstrated their skill. It was a rarity among Force-users, both Jedi and Sith. Mace Windu was known to have used an Electrum hilt for his lightsaber, as was Darth Sidious. This Electrum detail gives the lightsaber hilt a distinctive gold color. Electrum was also used to make jewelry. Electrum was mined on several planets, including Abregado-rae and Duros.