First an explanation of
Anukul / Pratikul

The Planetary Gemology World is divided into two (2) opposing philosophies, viz., Anukul-vad v/s Pratikul-vad:
ANUKULA-VAD: A Jyotish Gem will act "SAME" as it's planet - So gems should be chosen for Anukul (favorable) grahas
PRATIKUL-VAD: A Jyotish Gem will act "OPPOSITE" of it's planet - So gems should be chosen for Pratikul (unfavorable) grahas

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Anukul Planet's gem choosing method for resorting to or harnessing one's auspicious (Anukul) planet(s) (exalted, mulatrikona, own sign, benefic,  great friend, good house, owner of good house, etc.) based on the concept that lucky planet = lucky gem! In Jyotish there are basically two broad categories of planetary position, viz., favorable (to the chart) (Anukul) OR unfavorable (to the chart). One should avoid their weakness and cultivate their strengths. "Ratna-anukul" means the auspicious gem of strongest most desirable planet. Example: One has Leo Lagna - their lagna lord is Sun, who is exalted (100% strength) and posited in the 9th house which is all very auspicious. That person would be advised to use a fine ruby, the Sun’s gem, to attract or harness his auspicious influence. On the other hand if a person had Saturn debilitated (0% strength) and in the 8th house they would be advised to avoid Saturn’s gem blue sapphire and all other Saturnine things or activities. And better still they could donate a blue sapphire to pacify Shanideva. The followers of Anukul-vad believe that the pratikul-graha color is the unlucky color, and to magnify that bad color will simply increase the problems caused by that unlucky Planet. Both methods believe that gems increase cosmic colors of their planets, thus for an Anukuli it is considered to be suicide to increase a pratikul-graha's color. In Anukul there is never a case where a Pratikul (harmful to the chart/native) planet's gem should be worn as it will surely increase the ill fortune; but such gems for a Pratikul planet can be used by DONATING them - giving them AWAY - according to Shastric directions. A pure anukuli believes that a pratikul-gem is NEVER good to use; it is increasing the cosmic poison, and ill fortune (a person's bad cosmic vibes) should NEVER be increased. Anukul means a planet that is beneficially disposed either by being strong in own sign, good house, ruler of houses which will bring positive results, or otherwise not ill disposed nor inclined to produce evil influence. A planet which is good for the chart either naturally or by house ruler ship yet somewhat weakened by placement may be strengthened through the gem, or a planet which already is strong and giving benefic influence may be further strengthened for gains in particular areas of life by wearing the gem.

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Pratikul Planet's gem choosing method for overcoming a weak or evil planet, based on the misconception that a 'pratikul' (inauspicious) planet is strengthened by wearing it's gem and there by it changes from being inauspicious (pratikul) to become auspicious (anukul). ILLOGIC: By providing the gem for a malefic planet, benefic results will follow. Example: A person has Jupiter debilitated and a malefic which is inauspicious or pratikul, but by wearing Jupiter's gem, yellow sapphire or another yellow Jupiter jewel, it is believed that the 'weak' (troublesome) Jupiter gets strengthened and REVERSES to become auspicious. Some persons opine that a harmful planet means that the planet's "cosmic color" is weak. The gems for the planets are concentrated essential cosmic color rays; so by wearing the gem for the weak, Pratikul (harmful) color that weak color is strengthened, and when the weak color is stronger then the harmful influence will be REVERSED, removed or mitigated. Pratikul means a planet that causes evil influence or suffering to the native as seen through the horoscope. This may be a debilitated planet who is in a dusthana and enemy of the lord of the lagna, or otherwise disposed that the influence simply causes suffering.

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Before describing the most popular methods, let me first say that choosing gems which are favorable (Anukul for the native's chart) as well as clean (amala) and auspicious, these two are a MUST in planetary gemology. Of the 6 PGA CODES the prohibition against astrological use of synthetics is the least of all PG evils as synthetics have no harmful effect because they have NO effect whatsoever. The most important considerations are Anukul-graha gem choosing and flawless gems - 100% loupe clean down to 80% loupe clean is an acceptable range in our experience. Always exercise CAUTION with any gem that has clarity below 80% loupe clean. Very flawed gems are dead due to serious life-ending defects, and according to Shastra, "If anyone wears a gem with many flaws (even) out of ignorance, then grief, anxiety, sickness, death, loss of wealth and other evils torment them."--- Sri Garuda Purana:1.70.19

When choosing gems we must add up the pluses in a chart. For example, one chart has a planet exalted in a good house but a functional malefic and lord of two bad houses, so on the surface we have two pluses and three minuses or "+ + - - -" , i.e., a good sign placement, a good house placement, but it is unfavorable by nature for the native, and is lord of two bad houses. Another chart might have a debilitated planet that is a functional benefic and in a good house, and lord of two good houses, so that means a "- + + + +" In the first example we could rule the planet as borderline unfavorable (pratikul); but the 2nd case has the planet mostly favorable (anukul) - So a weak, beneficial planet can be made stronger. A strong anukul planet can also be made even stronger to attain certain goals, like making an exalted Sun even stronger because the native desires fame or increase in stature (provided the native HAS the karma to achieve that, because we cannot do BETTER than our karma).

Taking this further one could see planetary periods in motion, movements of Saturn, Yogini-dashas, as well as aspects, navamsa positions, etc. to first of all conclude if the planet in question is FAVORABLE - OR - UNFAVORABLE for the chart, all things considered. It doesn't matter if a planet is strong or weak, it only matters that the planet is judged as favorable (anukul-graha) or unfavorable (pratikul-graha). An anukul-graha can always be strengthened, but a pratikul-graha should never be strengthened

RATNA-ARPANA: Gems for Pratikul-grahas may be DONATED or GIVEN AWAY in a form of Vedic charity to achieve Graha-shanti is another subject known as, "Ratna-arpana." Using gem donations is he ONLY time an UNFAVORABLE planetary gem should be used by the native - by giving it AWAY. The native should be informed what planets are most FAVORABLE for them and then the native may choose from among their Anukul-graha-ratnas or favorable planetary gems.

Adding the plus and minus points to determine which planets are most favorable to the native enables us to proceed further.

1. First look to the lagna or rising sign and then check the lord of the rising sign to see if it is in an auspicious condition in the rasi and navamsa charts. If this is the case then we wholeheartedly prescribe the gemstone ruled by the lagna's lord. Example: If one has Leo rising we look to the position of the Sun (Lord of Leo) in the chart. If the Sun is posited in an auspicious sign, e.g., sign of exaltation, own sign, trine, or at least a friendly sign, it will act in a beneficial way. If any of these are the case then we may recommended ruby or another "Sun jewel" as one's first gem choice. NOTE: If the birth time is unknown or unsure then skip this method...

A list of the primary rising sign gems is given as follows: 

RISING SIGN (Lagna)	RULING PLANET	GEMSTONE
Aries	Mars	Red Coral
Taurus	Venus	Diamond
Gemini	Mercury	Emerald
Cancer	Moon	Pearl
Leo	Sun	Ruby
Virgo	Mercury	Emerald
Libra	Venus	Diamond
Scorpio	Mars	Coral
Sagittarius	Jupiter	Yellow Sapphire
Capricorn	Saturn	Blue Sapphire
Aquarius	Saturn	Blue Sapphire
Pisces	Jupiter	Yellow Sapphire

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2. We next check the position of the planet ruling one's mahadasha or major planetary period. If this planet is well-placed in both the rasi as well as the navamsa charts then we prescribe that planet's gemstone(s) for use during the duration of the mahadasha period. Example: If one is in or entering a Jupiter mahadasha and if Jupiter is posited in an auspicious sign and/or house position, then we recommend yellow sapphire or another natural yellow gemstone. At the time of ones birth a certain planetary period will be in motion. If a person is born in the middle of their Venus major period then they still have 10 more years of major Venus influence before they change into their Sun period at the age of 10 years. Each major planetary period follows a certain order and is of a fixed period of time - this information is given as follows:

SUN PERIOD: 6 years
MOON PERIOD: 10 years
MARS PERIOD: 7 years
RAHU PERIOD: 18 years
JUPITER PERIOD: 16 years
SATURN PERIOD: 19 years
MERCURY PERIOD: 17 years
KETU PERIOD: 7 years
VENUS PERIOD: 20 years

Depending on the period in operation when one is born, the soul will pick up the periods and pass through them in succession in the order given above. 

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3. Also look to one's birth sign or Moon rasi , i.e., the sign in which the Moon is posited at the time of one's birth. In sidereal astrology the Moon's sign position is considered very important. Example: If one's Moon sign is Leo, a sign ruled by the Sun, then look to the sign and house position of the Sun in the horoscope. If the Sun is located in an auspicious position in their chart (unless otherwise afflicted) then one can recommend a ruby or other red Sun jewel as one's "birth stone."

Here is the list of primary Vedic "birthstones"

BIRTHSTONE		RULING PLANET		MOON SIGN
Ruby		Sun		Leo
Pearl		Moon		Cancer
Coral		Mars		Aries/Scorpio
Emerald		Mercury		Gemini/Virgo
Yellow Sapphire		Jupiter		Sagittarius/Pisces
Diamond		Venus		Taurus/Libra
Blue Sapphire		Saturn		Capricorn/Aquarius
Hessonite		Rahu		N/A
Cat's eye		Ketu		N/A

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4. Then check the janma-naksatra or the constellation in which the Moon is posited at birth. Each of these 27 birth stars is ruled by one of the nine planets recognized in sidereal astrology. Example: If one's birth constellation is "punarvasu" (the 7th constellation), which is ruled by Jupiter, then look to the position of Jupiter in the horoscope. If Jupiter is located in an auspicious sign and/or house position in the rasi chart (unless otherwise afflicted) then recommend yellow sapphire or another yellow "Jupiter" jewel. 

Following is a list of the 27 constellations, their ruling planet and corresponding primary gemstone: 

BIRTH STAR	RULED BY	GEM
1. ASWINI	Ketu (Moon's South Node)	Cats Eye
2. BHARANI	Venus (Shukra)	Diamond
3. KRTTIKA	Sun (Surya)	Ruby
4. ROHINI	Moon (Chandra)	Pearl
5. MRIGASHIRA	Mars (Mangal)	Coral
6. ADRA	Rahu (Moon's North Node)	Hessonite
7. PUNARVASU	Jupiter (Guru)	Yellow Sapphire
8. PUSHYAM	Saturn (Shani)	Blue Sapphire
9. ASHLESHA	Mercury (Budha)	Emerald
10. MAGHA	Ketu (Moon's South Node)	Cat's Eye
11. POORVA-PHALGUNI	Venus (Shukra)	Diamond
12. UTTAR-PHALGUNI	Sun (Surya)	Ruby
13. HASTA	Moon (Chandra)	Pearl
14. CHITRA	Mars (Mangal)	Coral
15. SWATI	Rahu (Moon's North Node)	Hessonite
16. VISHAKA	Jupiter (Guru)	Yellow Sapphire
17. ANURADHA	Saturn (Shani)	Blue Sapphire
18. JYESTHA	Mercury (Budha)	Emerald
19. MULA	Ketu (Moon's South Node)	Cat's Eye
20. POORVASHADA	Venus (Shukra)	Diamond
21. UTTARSHADA	Sun (Surya)	Ruby
22. SRAVANA	Moon (Chandra)	Pearl
23. DHANISTHA	Mars (Mangal)	Coral
24. SATAVISHA	Rahu (Moon's North Node)	Hessonite
25. POORVABADRAPADA	Jupiter (Guru)	Yellow Sapphire
26. UTTARBHADRAPADA	Saturn (Shani)	Blue Sapphire
27. REVATHI	Mercury (Budha)	Emerald

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5. Next examine all the nine planets in the rasi chart to see if any are exalted. Planets which are in their sign of maximum strength (exaltation) give positive and beneficial results, and their gemstone(s) may be used with advantage. 

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6. Another consideration is sign ownership . A planet which is located in it's own sign will give beneficial results, and that planet's gem can also be used to advantage. 

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7. A further consideration is any planet which is in it's sign of mulatrikona or trine. A Planet in mulatrikona gives beneficial results similar to an exalted planet, and their gem(s) may be used to advantage. 

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8. A planet which is located in a friendly sign can also give beneficial results, and it's gemstone may be used to advantage. 

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9. The final consideration is 'preference' based on the characteristic "planetary influence." Example: If a person wishes to use a Sun jewel like ruby or red spinel to increase their name and fame, then they can use that stone provided the person's Sun is not located in an unfriendly or inauspicious sign and/or house position in their sidereal horoscope. 

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SPECIAL: Using Planetary Gems by DONATING them.  It is our experience that fine, natural gemstones do indeed "strengthen" or magnify the influence of their associated planets. Therefore, lucky planets = lucky gems. If a person intends to wear their lucky gemstone then they should only use gems which are related to planets that are considered to be "lucky" or posited in an auspicious rasi (zodiac sign) and/or bhava (house) in their sidereal birth chart. Gemstones do not alter or change the angle, position or condition in which planets are placed in one's horoscope. Methods for propitiating or reducing the harmful effects of evil or malevolently placed planets in one's birth chart include the chanting of planetary mantras, prescribed sacrifices and charity. These may be performed along with the use of associated planetary gemstones to help "magnify" the prayer. A person who is unwilling to perform these meritorious acts should not use gems for unlucky planets.