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2. Carat (mass) - Wikipedia

   en.wikipedia.org/wiki/Carat_(mass)

   The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat , was adopted in 1907 at the Fourth General Conference on Weights and Measures , [ 1 ] [ 2 ] and soon afterwards in many countries around the world.

3. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   However, this can come at the cost of lowering cut grade. If a diamond is too deep, the carat weight increases with a loss of brilliance due to light leakage. Diamond cutters have to contend with working a stone to its best finished form with the least amount of waste. This strategy depends on the quality of the stone and its final proportions.

4. Grain (unit) - Wikipedia

   en.wikipedia.org/wiki/Grain_(unit)

   For pearls and diamonds, weight is quoted in carats, divided into four grains. The carat was eventually set to 205 milligrams (1877), and later 200 milligrams. For touch or fineness of gold, the fraction of gold was given as a weight, the total being a solidus of 24 carats or 96 grains.

5. File:Gold Spot Price per Gram from Jan 1971 to Jan 2012.svg

   en.wikipedia.org/wiki/File:Gold_Spot_Price_per...

   English: This chart shows the nominal price of gold along with the price in 1971 and 2011 dollars (adjusted based on the consumer price index). The historical gold price was obtained from www.igolder.com; CPI was obtained from www.rateinflation.com.

6. Pricing strategies - Wikipedia

   en.wikipedia.org/wiki/Pricing_strategies

   Switching costs effect – the higher the product-specific investment a buyer must make to switch suppliers, the less price-sensitive that buyer is when choosing between alternatives. Price-quality effect – buyers are less sensitive to price the more that higher prices signal higher quality.

7. Markup (business) - Wikipedia

   en.wikipedia.org/wiki/Markup_(business)

   Markup (or price spread) is the difference between the selling price of a good or service and its cost.It is often expressed as a percentage over the cost. A markup is added into the total cost incurred by the producer of a good or service in order to cover the costs of doing business and create a profit.