I didn't do these calculations but I had copied them down from a posting back in April 2002. Hopefully this helps you out.
I tried to search for this thread but turned up nothing. Thankfully I copy stuff into Word when I find stuff useful for later.
bright silver cylinder (as cloak of etherealness, double duration), 208,000 g.p.
cerulean blue rhomboid (as ring of freedom of movement), 80,000 g.p.
dark blue rhomboid (Alertness), 8,000 g.p.
dark green ellipsoid (+5 luck bonus to AC), 125,000 g.p.
dark orange dodecahedron (spell resistance 21), 180,000 g.p.
dark purple pyramid (as ring of wizardry IV), 200,000 g.p.
dark purple triangle (as ring of wizardry III), 70,000 g.p.
dark red cube (as medallion of thoughts), 12,000 g.p.
deep red sphere (+6 Dex), 72,000 g.p.
dull orange rhomboid (as brooch of shielding), 3,000 g.p.
dusty rose prism (+5 deflection), 100,000 g.p.
incandescent blue sphere (+6 Wis), 72,000 g.p.
lavender and green ellipsoid (absorb spells up to 8th level), 40,000 g.p.
lavender and green ellipsoid (absorb spells up to 8th level), 40,000 g.p.
mottled gray sphere (as ring of counterspells, evasion, invisibility, and spell turning), 496,000 g.p.
pale green prism (+5 competence bonus to attack rolls, saves, and checks), 500,000 g.p.
pale lavender ellipsoid (absorb spells up to 4th level), 20,000 g.p.
pale white sphere (recall three 9th-level spells, as pearl of power), 405,000 g.p.
pearlized brown ellipsoid (as boots of speed, free action to activate), 16,000 g.p.
pearly black spindle (undead regenerate 1 point of damage/hour), 20,000 g.p.
rich green star (as +5 stone of good luck), 250,000 g.p.
scarlet and blue sphere (+6 Int), 72,000 g.p.
shining black spiral (as helm of teleportation), 48600 g.p.
vibrant purple prism (stores 6 levels of spells), 12,000 g.p.
vibrant purple prism (stores 6 levels of spells), 12,000 g.p.
RD