Gemstone for the Sun:  Ruby

Alternative gemstones for the Sun:  
Red Spinel, Garnet, Red Tourmaline

Shown above:  #9634 Sun Pendant, offered at $1,900 USD.
STONES : One (1) 100% clean, natural oval cut dark
rose red spinel weighing 0.42 carat.
SETTING : 21k (90%) yellow gold and 18k (75%) white
gold herbal pendant containing sacred ashes of Milk Weed
(Arka-bhasma) and stamped 53 VOOM 90%.

Shown above:  2.36 carat, natural red spinel, Sri Lanka,
set in 18 karat yellow gold ring.  SOLD!

Shown above:  1.98 carat, Burmese Red Spinel, heart cut,
brilliant, pure medium red color.
Offered at $8700, plus tax and shipping.

Shown below:  Pink Sapphire  pendant, 9.65 carats, African source, oval cabochon, set in 14 karat gold Vedic setting.  Offered at $1,600, plus tax and shipping.  Price includes planetary puja for the Sun.

Gemstones for All Nine Planets:  Navaratna ( See Astral Gemstone Talismans )

Gemstone for the Sun:  Ruby
Gemstone for the Moon:  Pearl
Gemstone for Mars:  Red Coral
Gemstone for Mercury:  Emerald
Gemstone for Jupiter:  Yellow Sapphire
Gemstone for Venus:  Diamond
Gemstone for Saturn:  Blue Sapphire
Gemstone for Rahu:  Hessonite Garnet
Gemstone for Ketu:  Catseye Chrysoberyl