Ehud Arye Laniado - global diamond expert
Change in diamond indices for the previous month
  1. 0.30-0.39 Carat Rounds D-M IF-SI213.680.47 (3.6%) 0.30-0.39 Carat Semi Rounds D-M IF-SI29.360.01 (0.1%) 0.30-0.39 Carat Squares D-M IF-SI28.11-0.07 (-0.9%) 0.50-0.69 Carat Rounds D-M IF-SI220.240.44 (2.2%) 0.50-0.69 Carat Semi Rounds D-M IF-SI215.030.01 (0.1%) 0.50-0.69 Carat Squares D-M IF-SI213.30-0.06 (-0.4%) 0.70-0.89 Carat Rounds D-M IF-SI226.56-0.09 (-0.3%) 0.70-0.89 Carat Semi Rounds D-M IF-SI220.75-0.36 (-1.7%) 0.70-0.89 Carat Squares D-M IF-SI217.48-0.52 (-2.9%) 1.00-1.49 Carat Rounds D-M IF-SI251.290.98 (1.9%) 1.00-1.49 Carat Semi Rounds D-M IF-SI234.410.27 (0.8%) 1.00-1.49 Carat Squares D-M IF-SI227.56-0.74 (-2.6%) 1.50-1.99 Carat Rounds D-M IF-SI265.891.32 (2.0%) 1.50-1.99 Carat Semi Rounds D-M IF-SI250.560.77 (1.5%) 1.50-1.99 Carat Squares D-M IF-SI245.24-0.67 (-1.5%) 2.00-2.99 Carat Rounds D-M IF-SI291.761.17 (1.3%) 2.00-2.99 Carat Semi Rounds D-M IF-SI268.041.00 (1.5%) 2.00-2.99 Carat Squares D-M IF-SI259.31-1.05 (-1.7%) 3.00-3.99 Carat Rounds D-M IF-SI2137.54-0.57 (-0.4%) 3.00-3.99 Carat Semi Rounds D-M IF-SI2104.34-1.22 (-1.2%) 3.00-3.99 Carat Squares D-M IF-SI288.27-2.09 (-2.3%) 5.00-5.99 Carat Rounds D-M IF-SI2235.611.18 (0.5%) 5.00-5.99 Carat Semi Rounds D-M IF-SI2179.401.36 (0.8%) 5.00-5.99 Carat Squares D-M IF-SI2155.831.27 (0.8%) 10.00-14.99 Carat Rounds D-M IF-SI2401.331.97 (0.5%) 10.00-14.99 Carat Semi Rounds D-M IF-SI2333.410.50 (0.2%) 10.00-14.99 Carat Squares D-M IF-SI2334.260.50 (0.1%) 20.00-29.99 Carat Rounds D-M IF-SI2562.770.00 (0.0%) 20.00-29.99 Carat Semi Rounds D-M IF-SI2459.870.00 (0.0%) 20.00-29.99 Carat Squares D-M IF-SI2459.840.00 (0.0%)


Diamond Portraits: Hans Stern

One of the most revered and popular jewelry brands was born out of unusual circumstances. Most of today’s leading diamond brands were formed either in Europe or the US. Even then, they were established in one of a very few cities – Paris, London or New York City. H.Stern, however, was formed in Brazil by a Jewish immigrant, who escaped Nazi Germany as teen right before World War II.

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Mercury Polished Diamond Prices: Prices Continue to Rise in February

Mercury Polished Diamond Prices: Prices Continue to Rise in February

January’s rising polished diamond prices continued into February on the back of awakening demand. Polished diamond prices had suffered from an extended period of declining prices since mid-2014. However, after improved retail sales in the US over the November-December holiday season, demand for polished diamonds improved, pulling up prices.

In February, prices of smaller goods, as well as one and two caraters improved, yet a few key sizes pulled back a little, according to the Mercury Diamond Global Tracker™ (MDGT™), an index of polished diamond transaction prices. The steady prices, following an extended period of price declines, are a welcome sign of stability for the global diamond industry.

Price Index Edges Up

The MDGT™ averaged 114.94 in February, up 0.08% from 114.85 in January. Prices began inching upward in late December, as demand from American consumers peaked ahead of Christmas. Prices continued to rise in January, as American retailers sought to replenish inventories and prepare for Valentine’s Day (February 14). At the same time, retailers in China also stocked up ahead of the Chinese New Year celebrated in February. In addition, high expectations from the trade fair in Hong Kong further buoyed prices.

The positive news follows an extended period of sinking polished diamond prices. Since May 2014, the index has mainly posted a series of very small monthly declines, some of them stretching over five consecutive months and at times as many as nine months in a row. Although mainly small month-over-month declines, the cumulative effect was meaningful, totaling 2.4% in the nine-month period of April-December 2017.

Polished diamond prices peaked in April 2014, when the index reached 142.3. Since July 2014, the index has exhibited a steady decline with a few notable respites through the 43-month period. On a year-over-year basis, the index declined 2.1% and has been declining steadily on a year-over-year basis for more than three years. The last time the index showed an upward year-over-year trend was in November 2014.

Since its peak in April 2014, the MDGT™ index has fallen 19.3%. In effect, polished diamond prices have eroded by nearly one fifth of their value.


MDGT™  is based on the transaction prices of diamonds weighing 1-30 carats, collected and used for the Mercury Diamond™ Price List . It provides wholesale polished diamond prices based on transaction prices in the wholesale market, and its primary purpose is to serve the wholesale market.


In February, the index declined by 2.0% year-over-year, a continued deceleration compared to the 2.7% declines in September and October, the 2.6% decline in November, and the 2.4% in December. The year-over-year declines, although milder than those experienced in 2016 and 2015, are still worrying as a cumulative trend of ongoing sliding prices.


The change in price direction that started in December 2017 seems to have lost some steam in late February. Although the month largely ended with price increases, a relatively subdued trade fair in Hong Kong put a halt on price increases, and in many cases wholesale prices of polished diamonds started to soften during the last few days of the show. According to our latest indications, price decreases continued in early March.

Historically, polished diamond prices tend to hold strong and even increase in January as demand from retailers replenishing their store inventories drive prices at a time of shortages. Another trend is a decline in price after the show in Hong Kong. These two cyclical trends are sometimes impacted by unusual market behavior, mainly when demand differs from expectations. When consumer demand during the November-December holiday season is below expectations, prices tend to weaken in January. Similarly, if demand at the Hong Kong show exceeds expectations, prices tend to rise in March.

Despite the trends returning to “normal” – good consumer demand in December, shortages in the wholesale market and the edging down of year-over-year declines – the diamond industry is not yet in the clear. For that to happen, we need to have robust consumer demand throughout the year, and we are still waiting for that.


Over the past two years, overall polished diamond prices increased only rarely on a month-over-month basis. It happened twice in 2016 and once in 2017. The month-over-month declines have become the norm in recent years, although price changes are more volatile on a month-over-month basis, reflecting seasonal changes neutralized in year-over-year comparisons.

In 2017, prices were especially weak for a four-month stretch. Between May-August, with very few exceptions, prices fell across the board in every category. That was a period not only of vacations, but also of a slowdown in sales and demand that hurt the diamond industry to the point that it took more than a few companies to the brink.

Prices Rise Across the Board

The MDGT™ index is composed of the price performance of many different diamonds, of many different size ranges, from 1 carat and above. In February, the smaller goods generally enjoyed higher price increases than larger goods. Compared to January, prices of many smaller round-shape diamonds increased considerably due to shortages in the market. Thirds (0.30-0.39-carat) rose by 3.6%, and half carats increased by 2.2%. Prices of 1-2-carat rounds posted strong increases: 1-carat rounds +1.9%, 1.5 +2.0% and 2-carats by 1.3%. Prices of large round-shaped goods demonstrated mixed price performance. Three-carat rounds declined 0.42% and 5-carats increased 0.5%, as did 10-carat rounds.

These changes in the price of rounds continued and strengthened the price trends in February, mainly for goods weighing 2 carats and less.


Despite the recent price increases, polished diamond prices have only partially caught up with their prices just a year ago. Thirds are by far the best performers, rising nearly 8% year-over-year. Half carats are 9% below their price a year ago. One carats are still lagging behind, and 1.5-3-carat rounds have inched up above their prices during February 2017.

Thirds and 3-carat rounds are the only two items that have posted an overall year-over-year price increase for the second consecutive month. With price increases expanding to a few other key sizes, this is a positive indicator. The challenge now is for prices to continue to rise or at the very least remain steady in the traditionally slower months of March and April.



Following a period of over three years, polished diamond prices have started to inch upwards. This positive trend reflects consumer demand as well as availability in the market. We believe that the current retail prices reflect what consumers are willing to pay, explaining the rise in demand from retailers. If the diamond pipeline, from mining to jewelry making, can align itself to these new values, it could serve as a basis for rebuilding consumer interest in diamond jewelry and, with time, set it on a growth path. This may translate into a certain decline in prices in March to adjust prices back to their December or January levels.


About MDGT™ and the Mercury Diamond™ Price List

We have developed a system that collects transaction prices from a wide range of manufacturers, traders and retailers. These many monthly transactions are augmented by constant market research, which backs, double checks, verifies and completes the transaction data. The system covers more than 18,000 polished diamond categories across the 4Cs, including polished diamonds weighing up to 30 carats with clarities ranging from Flawless to I3, in colors from D to P and in various shapes

The price list provides a price for a top stone without any irregularities. There is a separate table of irregularities, which provides the necessary discount or premium to find the exact current price of any particular diamond.

This polished diamond pricing system was reviewed and validated by one of the Big 4 accounting firms, and that firm continues to audit the price list monthly. The pricing system is currently in the process of obtaining a patent in the United States. Traders will not only find the current transaction price of each diamond, but by applying their manufacturing costs, they can also “reverse engineer” to calculate the cost of rough diamonds.

We currently publish the price list monthly, on the tenth of every month. It is also available in the form of a ticker. Take a look at this important alternative, which has the potential to contribute to an important change in the market. Please download the list and test it. We offer it to you with the hope that you will consider using it regularly. 


  The views expressed here are solely those of the author in his private capacity. No one should act upon any opinion or information in this website without consulting a professional qualified adviser.




Mercury Polished Graph Tool

Mercury Polished Graph Tool

Mercury Diamond Global Price Tracker™

Mercury Diamond Global Price Tracker™
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