Though technically not a "stone", goldstone is a manufactured gem, also known as "Aventurine glass." Goldstone is a glittering silica glass and can be brown, blue, purple or green by using different metallic crystal compounds in the glass, usually copper, cobalt, manganese or chromium oxide. Commonly known as the "stone of ambition."
Depending on the metallic compounds, it's said that for example, Blue goldstone is believed to transmit healing energy, increase self-acceptance, aid in learning and soothe hypersensitivity and is thought to be the ideal stone for empaths.
Brown goldstone has the copper aspect to it and is believed to carry many of the metaphysical properties of that metal. It is thought to generate and revitalize energy fields, transmit positivity and divert malevolent energy into the earth.