Prescription on the basis of First letter of the Name
In this system the gemstones are prescribed on the basis of the first letter of the name of the person as per Indian sound of pronunciation of that letter. The system gives very indifferent results and is not very popular. The reason is that, in modern times the names are not given on the basis of the astrological consultations by people and the prescription of a gemstone may not be in tune with the actual horoscope of the native. The table below gives the bird's eye view of details of the system

Gem (images) Gemstones First Letter of Name Lord of Sign/Sign Red Coral Choo, chey, cho, laa, lee, loo, ley, low, aa Mars / Aries Diamond Ee, oo, ey, o, vaa, vee, voo, vey, vo Venus / Taurus Emerald Kaa, kee, koo, ghau, dau,chhau,ke,ko,haa Mercury / Gemini Pearl Hee,hoo,hey,ho,ddaa,ddee,ddoo,ddey,ddo,aa Moon / Cancer Ruby Maa,mee,moo,mey,mo,ttaa,ttee,ttoo,ttey Sun / Leo Emerald Tto,paa,pee,po,poo,pey,shshau,nnhau,tthau Mercury / Virgo Diamond Raa,ree,roo,rey,ro,thaa,thee,thoo,tey Venus / Libra Red Coral Tho,naa,nee,noo,ney,no,yaa,yee Mars / Scorpio Yellow Sapphire Yey,yo,bhaa,bhee,bhoo,dhau,phaa,ddaa,bhey Jupiter / Sagittarius Blue Sapphire Bho,jaa,jee,khee,khoo,khey,kho,gaa,gee Saturn / Capricorn Blue Sapphire Goo,gey,go,saa,see,loo,ley,low,aa Saturn / Aquarius Yellow Sapphire Dhee,dhoo,thaw,jhaw,bhaw,dhey.chaa,chee Jupiter / Pisces