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On the AH it seems like the cost to buy some of the gems outright is cheaper than it is to combine 3 lesser gems, but I don't have any to check. How much does it cost (in gold and materials) to combine gems between each quality level?

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up vote 30 down vote accepted

In case you were interested in the cumulative costs:

Cumulative costs starting with chipped gems

Rather than starting with a Chipped gem, here are cumulative costs starting with Flawless Squares (the highest rank gem that drops):

Cumulative costs starting with flawless squares

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I've listed all of the costs below. Remember, that this is the cost in addition to the gems of the previous level.

The recipes below require 2 gems of the previous level

  • Rank 1 Chipped: n/a
  • Rank 2 Flawed: 10 gold
  • Rank 3 Regular: 25 gold
  • Rank 4 Flawless: 40 gold
  • Rank 5 Perfect: 55 gold and 1 Page of Jewelcrafting
  • Rank 6 Radiant: 70 gold and 2 Pages of Jewelcrafting
  • Rank 7 Square: 80 gold 1 Tome of Jewelcrafting
  • Rank 8 Flawless Square: 100 gold and 2 Tomes of Jewelcrafting

The gems below do not drop and must be crafted using 3 gems of the previous level

  • Rank 9 Perfect Square: 30,000 gold and 3 Tomes of Secrets
  • Rank 10 Radiant Square: 50,000 gold and 6 Tomes of Secrets
  • Rank 11 Star: 80,000 gold and 9 Tomes of Secrets
  • Rank 12 Flawless Star: 100,000 gold and 12 Tomes of Secrets
  • Rank 13 Perfect Star: 200,000 gold and 15 Tomes of Secrets
  • Rank 14 Radiant Star: 400,000 gold and 20 Tomes of Secrets

Thankfully, Gems in Diablo III are reusable, so you won't have to recreate Rank 14 gems every time you get a new socketed upgrade.

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Might want to add that flawless square is the highest possible drop, and you'll need 729 of those in total to get a Radiant Star. – Mr. November May 20 '12 at 17:19
@Mr.November Thanks for that info. Added. – Raven Dreamer May 20 '12 at 17:35
@RavenDreamer Also, if you disenchant an item with a gem, it'll give your gem back. – Michel May 21 '12 at 17:02
Stats fixed. Man, Rank 14 is expensive. – Raven Dreamer May 21 '12 at 18:48

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