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'Shine' is an observed, subjective judgement, and you are the judge.
At least two characteristics are involved in gemstone shine: cut/ clarity of the stone and the innate refractive index of each.
A flawless diamond of an excellent cut is impossible to match in terms of gemstone shine. Both emeralds and rubies are valued on colour, then on clarity or cut.
Practically, diamond has a high refractive index 2.4 according to "Standard refractive index measurements taken at yellow doublet sodium D line, with a wavelength of 589 nanometres"1. Ruby measures 1.76 and emerald measures 1.57.
You can compare gemstones and the refractive index of each, below.
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1 Wikipedia: List of Refractive Indices
What else can I help you with?
What gem is more precious the diamond ruby or emerald?
The Ruby is more expensive.
Ruby is to scarlet as jade is to what?
emerald
Where to get registeel in diamond?
you have to migrate it in from ruby sapphire or emerald
Can you catch a torchic in Pokemon Diamond?
No, you have to migrate it from Pokemon Emerald, Ruby or Sapphire. No, you have to migrate it from Pokemon Emerald, Ruby or Sapphire.
How do you get a keckleon on Pokemon Diamond?
migrate from Ruby/Sapphire/Emerald
How do you get raquazer in Pokemon diamond?
Migrate it from Ruby Sapphire Emerald
On Pokemon diamond where do you get regesteel?
you have to migrate it from sapphire/ruby/emerald
How do you get a whismur in diamond?
You have to trade it from either Ruby, Sapphire, or Emerald.
How do you get the regeies in Pokemon diamond?
You have to migrate them from saphire, ruby or emerald.
How do you get the 3 regis on diamond?
migrate from ruby sapphire and emerald
Where is regirock in diamond?
In Diamond you can't catch Regirock, you have to migrate it from Pokemon Ruby, Sapphire, or Emerald.
How do you get RegirockRegisteeland Regice in Pokemon Diamond?
Migrate from Ruby Sapphire or Emerald.
