According to many gem labs, the Padparadscha is defined as “a variety of corundum from any geographical origin whose colour is a subtle mixture of pinkish orange to orangey pink with pastel tones and low to medium saturations when viewed in standard light."
The following labs that follow this definition of are: CGL Laboratory (Japan), CISGEM Laboratory (Italy), DSEF Laboratory (Germany), GIA Laboratory (USA), GIT-Gem Testing Laboratory (Thailand), Gubelin Gem Lab Ltd (Switzerland), and Swiss Gemmological Institute-SSEF (Switzerland). GIA describes Padparadscha Sapphire: as “salmon or sunset” color. Others compare the color to the flesh of a ripe guava.
In spite of these differing color descriptions, people in the industry usually agree that padparadscha sapphire colors are intensely saturated and range from light to medium pinkish orange to orange-pink. GIA Pioneer Robert Crowningshield, cited one of the earliest recorded definitions of Padparadscha Sapphire: “padmaraga in Sanscrit refers to lotus color or rose red…in Bengali: padmaraga and padmaragmani, ‘mani’ being the suffix for the stone.”
He goes on to conclude that Padparadscha is a semantic change derived from a true Sinhalese word: “padmaragaya (lotus-color).
The difference between padparadscha sapphire and a fancy sapphire: while color alone as noted above can show the subtleties between orange and pink and padparadscha, a recent phenomenon has revealed that certain sapphires may appear as padparadscha at first, but fade over time into a pastel pink colored sapphire. As a result, the LMHC in its Information Sheet #4 Publication updated the list of Padparadscha disqualifications: if the stone has any colour modifier other than pink or orange, if the stone has major uneven colour distribution when viewed with the unaided eye and table up +/- 30°, the presence of yellow or orange epigenetic material in fissure(s) affecting the overall colour of the stone, if the stone has been treated by irradiation, and if the stone has been dyed, coated, painted, or varnished.
This test, commonly referred to as the “color stability test” exposes the fancy gemstone under high temperature/or strong light over a span of time to determine whether the color remains the same or changes. An unstable color for a padparadscha will become pinkish (emphasis added). Each lab may have a different method of conducting this test. The important result of any methodology is that a true padparadscha sapphire will not fade under any lighting or heating circumstances. What’s important to note here is that a sapphire may appear to have beautiful orange pink and/or pink orange hues, but simply fade away and lose it. The fading must reach a level that falls outside the narrow definition of padparadscha to a point where it simply appears as a pink sapphire.
It was March of 2016, when my father and I had just finished walking the annual Bangkok Gem Show when a Sri Lankan Gem dealer invited us to his local office to show us some gemstones. He presented us with a beautiful clean sweet pinkish orange untreated padparadscha sapphire that we immediately needed to buy. Much to our delight we negotiated the price, and later confirmed the stone as Padparadscha with GIA the following month. We had many interested buyers for the stone because of its color and size, at over 5.5 carats, such qualities were extremely hard to come by for padparadschas. Overtime, my father pointed out to me that the stone would now appear lighter than it did in Thailand. Despite my father's concerns, I dismissed the notion that it was lighter shade than before, and there's theories behind them. Many gem dealers have a theory that stones always appear more intense in Asia because of the sun, and lose some intensity upon arrival to the USA. I eventually realized he was right. The Sapphire now had a pastel color that no longer resembled the stunning Padparadscha. Before labs knew anything, there were rumors about foreign gem dealers and their practices with the sapphires.
They would leave their stones out in the sunlight before attending trade shows. This practice would apparently improve color saturation. Soon as a I began to investigate and piece together what happened to my stone, I had a eureka moment. After multiple trade shows, we noticed the stone stayed under strong showcase lighting, it seemed feasible that this had an effect on color. Going forward, we decided to do our own testing. I spoke to some senior gemologists in the trade, who were aware of such a phenomenon in yellow sapphires that called “trapped color holes.” As far as they knew, this was not something recognized in other fancy colored sapphires. These color centers can also be effected by UV lighting. We bought a UV light and tested it out for ourselves. Our results revealed that UV lighting turned pastel colors into orange on certain stones. Specifically, our 5.57 cushion actually returned to its original color. We decided that these color shifting stones were going forward, we would leave stones out by our office window to see if they would lose color after one week. This would be our in house test before purchasing any padparadschas. It was simple yet effective and gave us insight on these gems.
SSEF was the first lab to report this phenomenon in Padparadschas in 2018. In 2018, the article (which can be found here), discusses how the color stability of sapphires from a certain location would change. They attributed this to a single corundum deposit. However, it would appear that this was not the only mine. According to SSEF, stones that shift from orange to pure pink will not be called padparadscha. They will be called fancy sapphires with an explanation letter added to the report. They key being that Padparadscha must not show pure pink colour shift.
In November of 2018, the main international labs followed SSEF. The Lab Manual Harmonization Committee (LMHC), updated the Padparadscha definition to address color stability test. Members include (in addition to SSEF): CGL Laboratory (Japan), CISGEM Laboratory (Italy), DSEF Laboratory (Germany), GIA Laboratory (USA), GIT-Gem Testing Laboratory (Thailand) and Gübelin Gem Lab Ltd. (Switzerland). According to these labs, the term padparadscha sapphire will not apply to sapphires shifting to pink by a colour stability test.
Since GIA has adopted this definition, the color stability test can change results of reports previously classified as Padparadscha. For example, take a look at this 4.10 carat sapphire with 2013 GIA Padparadscha Report that went under new testing. The seller tried to sell us this stone as Padparadscha. We insisted a condition based on an updated report. The new results were extremely telling:
This new report would indicate that the stone’s color has changed so significantly that it no longer meets GIA’s acceptable pink orange or orange pink saturation level. We were surprised, yet relieved. Our suspicions were confirmed and labs were finally beginning to address this issue. Even though certain sapphires might fade to pink, it appears to be possible that the color could fade, and still meet the minimal acceptable padparadscha color range. These Padparadscha’s can be considered unique because they change into two varietal colors of Padparadschas consistent with the color’s range requirements.
Each Padparadscha Sapphire looks different. The LMHC understand that the hue ranges from light to medium. Pink-Orange, and Orange-Pink combined with light to medium leaves a multiple potential colors. Color stability testing reveals how saturation can become lighter. The degree of lighter color will either fall outside the range of
Padparadscha’s acceptable hue or inside its range. This 1.12 Cushion is described as Light Orangey Pink and Pinkish Orange. This unique situation shows that certain sapphires with shifting colors can still meet the Padparadscha criteria, granted they do not only appear pink. The transformation of a sapphire too pink seems to be accepted as a disqualification for Padparadscha.
Comment on report: Color stability test applied. No indication of fading was observed. Post-testing exposure to UV- or sunlight will not increase the color saturation and/or cause a change in hue. Ideally, Type 1 is the top-level color stability a stone can have. In plain english, this means that your Padparadscha’s color will not change under any circumstance.
Comment on report: Color stability test applied with indication of orange and/or yellow component fading was observed. Post-testing increase of color saturation and/or change of hue by exposure to UV- or sunlight is possible. Type 2 means your stone has a brightness to it that will go away. The brightness comes back with prolonged exposure to sunlight or UV light. Once the stone fades, the color you see is what your padparadscha will look like most of the time.The best way to test your stone out yourself is to leave it by the window for a prolonger period of timing making sure daylight is on the stone. We suggest a minimum of 1 week exposure to see if the stone loses color.
Comment on report: Color stability test applied. No indication of fading was observed. Post-testing increase of color saturation and/or change of hue by exposure to UV- or sunlight is possible. Type 3 is the flip side of type 2. If the color already appears faded, and it is submitted to the lab, this is considered “uncharged.” The Charging occurs when sunlight enhances the brightness.
Type 4 is on the border of being Padparadscha. If the color fades, the permanent seen color might be too light to be considered Padparadscha. In these scenarios, the color of the stone upon submission will no longer look the same when returned to you, and will not be able to return back to the color you originally had.One of our earliest purchases involved a padparadscha that over time gradually lost its color. This image to the right depicts a 5 carat Padparadscha we bought in 2016. Over time, we noticed the color faded.We paid more for the original color which was not permanent.
Each lab report has different standards for gemstones identification. You must consider which lab you want to rely on. Gemstone sellers must disclose any treatments. However, sometimes they might not even be aware of the modern definition of Padparadscha. We always use independent reputable labs for our gemstones. Our padparadscha are depicted in their actual color. We do not improve the color artificially. What you see in our inventory is what you get. Never rely on self serving gem reports issued by the seller to determine whether a sapphire is a padparadscha. The definition always hinges on “low to medium” saturation.
On the color Spectrum, intense pinks and oranges will be deemed fancy sapphires. The subtle difference between medium and high saturation may seem arbitrary, but makes all the difference. The Rare Gem’s opinion that the best and most accurate way a Padparadscha Sapphire can be properly given the true classification is by a reputable gem lab that abides by the standard’s set forth by the LMHC. We also believe the strict standard set by AGL is sufficient. We respect GRS is one of the premier gem labs. However, not all GRS lab reports with Padparadscha are the most accurate representations of acceptable color.