Each date of the western calendar is linked to a number, color and gem. Here’s a lowdown for you. You could wear garments, hairbands, wristbands or watches in the prescribed color depending on the date. You could pick the gemstones accordingly too.
Lucky No. 1 (Calendar date 1-10-19-28)

Ruled by sun
Lucky colors - white, golden, yellow and cream
Gems - ruby, topaz or any other reddish stones
Lucky No. 2 (Calendar date 2-11-20-29)

Ruled by moon
Lucky colors - white, cream and pink
Gems - pearl, moonstone, opal or any other white stones
Lucky No. 3 (Calendar date 3-12-21-30)

Ruled by Jupiter
Lucky colors - orange, purple and blue
Gems - yellow sapphire, yellow topaz or any other yellowish stones
Lucky No. 4 (Calendar date 4-13-22-31)

Ruled by rahu
Lucky colors - black, pale red, color of cow’s urine, color of pigeon and bright but soft colors
Gems - Hessonite garnet (gomedakam)
Lucky No. 5 (Calendar date 5-14-23)

Ruled by Mercury
Lucky colors - Shades of green, gray of the dove and off white
Gems - emerald, peridot, onyx, jade and green-hued stones
Lucky No. 6 (Calendar date 6-15-24)

Ruled by Venus
Lucky colors - Twilight, light blue, light green and bright white
Gems - diamond, quartz, zircon, white aquamarine, and crystal-color stones
Lucky No. 7 (Calendar date 7-16-25)

Ruled by ketu
Lucky colors - yellow, cream, light green and light blue
Gems - cat’s eye, tiger eye and hawk’s eye
Lucky No. 8 (Calendar date 8-17-26)

Ruled by Saturn
Lucky colors - black, gray, brown and all shades of blue
Gems - amethyst, blue sapphire, violet blue sapphire, black sapphire and iolite,
Lucky No. 9 (Calendar date 9-18-27)

Ruled by Mars
Lucky colors - red, scarlet red, violet, pink rose, crimson and post-office red
Gems - red coral, blood stone or any reddish stone
(The writer could be contacted at 0471 2324553, +91 9526480571 and +91 9447251087 or at jyothisgems@gmail.com. Jyothis Astrological Research Center, Lulu Apartments, Opp. Thycaud Police Ground, Thycaud P O, Thiruvananthapuram 14.)