Buying rough can be a very complicated undertaking. The following article present some notes that may be useful to consider when buying online. There are broadly three main types of rough: facet rough, cab rough and specimen or collector rough. Of course in reality, there are hundreds as they are all unique.
The first and most widely used is facet rough. When purchasing facet rough online you should be aware of the following:
1. Pictures are usually magnified so buyers can have a better view of the stone (a kind of "virtual loupe"). This will obviously make the stone appear much larger than it really is. To avoid being surprised when you receive your purchase, we recommend that you carefully check the dimensions given for a piece of rough. A useful tip is to sketch it on paper to get a real idea of the size.
2. Pictures may be enhanced to make the stone look much better than it is in real life. Honest sellers will only ever adjust pictures in order that the image matches the colour seen in real life as closely as possible. Colour may vary between computer monitors and under different lighting conditions but the aim with gemstone photography is always to present the most accurate image possible.
Unfortunately, a dishonest seller can tweak the photographs so drastically that it bears little relation to the rough you are buying. Difficult to get around this problem but we recommend that you look at the photographs very carefully and look for evidence of excessive retouching. Comprehensive description of the rough including highlighting of any potential problems is a good sign of an honest trader.
3. If it sounds too good to be true, it probably is ! Synthetic rough can be made to look just like the real thing – inclusions are now being deliberately manufactured in synthetics in order to fool buyers. Buying from a trusted seller with a rock-solid return policy will reduce your risk of bad buying. Buying as close to the source as possible reduces the chances of synthetics being slipped into the parcel – buying direct from the miner is as close to the source as possible.
4. Chemical enhancements are widespread in many countries. These treatments drastically change the colour of the original stone and are often still sold as natural. This stone is not as valuable as fully natural untreated rough and will not appreciate in value like a truly natural gemstone. Honest sellers will clearly specify what treatments (if any) have been done.
In sapphire, be especially careful of yellows, orange-pink (often described as padparascha colour) and oranges as most of these colours available in the market currently are the result of Beryllium treatment (bulk diffusion). Natural rough in these colours will be clearly identified and be priced at a premium (treatment status should be guaranteed in writing by the seller). If treatment is not mentioned, you should probably assume that the rough has been treated. Sapphire may even be coloured blue by diffusion treatment with titanium – this is less common in rough as the colour is surface only and easily detected – something to watch out for though.
5. Recovery percentages in sapphire for cut from rough is usually only around 25% ( this varies but this is a good rule of thumb). So if you are aiming for a 2 carat finished gem, you need to look for at least an 8 carat piece of rough. Recovery percentage may be lower if the piece of rough is poorly shaped – sometimes rough with excellent colour and clarity may be discounted for this reason.
6. Some shapes are harder to obtain from sapphre rough – for example larger rounds are less common as there is normally more wastage from the rough to achieve this shape. Ovals, cushions and emeralds are far more common due to the typical shape of sapphire rough. Although dog tooth crystals are often passed over, these can be cut in very attractive pears and briolette shapes – keeping in mind that colour zoning is sometimes a issue in these crystals (colour is often lighter at the crystal tip).
7. Plans for the shape and size of a cut often need to change as preforming is carried out as even the best expert can miss a hidden flaw or inclusion when inspecting the rough. Remember that this is a natural product and perfection is exceedingly rare – if you want perfect rough at bargain prices, we suggest you buy synthetic. We find though that good cutters who want their work to be interesting and challenging appreciate working with rough made by Mother Nature. Please note that Aussie Sapphire accepts returns on rough in original condition only so please inspect your rough very carefully before starting any work.
8. Rough of most gemstones including sapphire almost always has inclusions that need to be worked around. Perfect rough is very rare and if found is extremely expensive. When buying rough online, you should inspect the photograph and description carefully – good sellers will always highlight any noteable points about each piece of rough to assist you. Feel free to ask questions before buying. A no-fuss return policy is critical when buying online but it is easier for everyone concerned if this is not necessary – the need to return rough will be far less likely if you look for detailed descriptions and ask questions before buying. Some sellers list their rough with almost no description but we suggest that you are buying at a higher level of risk in these cases.
9. You normally get what you pay for. We try and price our rough according to colour, clarity,and estimated percentage of waste. Therefore, in most cases, paying slightly more per carat will work out cheaper in the long run.
CABOCHON ROUGH (CAB ROUGH):
Cab rough should be much cheaper than facet grade as it has some inclusions, may be a darker colour or is less transparent (translucent or opaque instead of fully transparent).
Star sapphires are sometimes achieved from this type of rough but are rare and difficult to pick and take some skill on the part of the cutter to achieve a good star. Much of the rough being sold on Ebay as suitable for cutting star sapphire will be disappointing – dont buy a pound of this stuff at bargain basement prices and expect every piece to produce a star.
Note that diffused star sapphires are very common in the market and are extremely cheap. These are produced by a treatment on the surface of the finished gem and are worth only a fraction of the value of a natural star sapphire.
Cabs are great fun as they are cheaper and faster to make, quick and easy to learn and can produce a fantastic, attractive gemstone.
Some rough is far more valuable in its natural state and may never be cut.
No two pieces are ever the same and price is determined by rarity along with other factors such as large size, interesting or unusual shape and colour, type of inclusions, etc. Dog Tooth sapphire crystals are a good example of ones to collect as these come in a variety of forms with interesting appearance.
Sometimes this type of rough does not officially enter the marketplace but are offered directly to collectors who have standing orders for exceptional pieces. If you are interested in purchasing collector rough, it is a good idea to develop a relationship with a small number of sellers who can keep you informed when something interesting turns up. This way, you have a better chance of purchasing some of these off-market special pieces.
SOME GENERAL COMMENTS:
The easier and best resources of the worlds sapphire have already been mined. New areas will be discovered but the chances of bulk amounts of higher quality rough coming back on the market are low. Prices for rough sapphire are very low by historical standards so any sensible purchase of good quality natural sapphire can only increase in value from current levels.
Often, if you need a specific size in a finished gem, it may be better to purchase a cut gem to your specifications. This way, you know exactly what you are buying without the risk of a piece of rough not cutting as expected. Often for specific orders, we may have to use two or more pieces of rough before we achieve a perfect result. Depending on your needs, it may be a better option to select from our extensive range of cut sapphire and other gems.
One last point – we are often asked why we are selling both rough and cut sapphire when cut sapphire is worth so much more per carat. One person asked "if this piece of rough is so good, why dont you cut it yourself ?" – he passed out on that piece thinking it was somehow inferior and it was snapped up quickly by another more astute buyer. We answered his question quite simply: demand is strong for high quality rough sapphire in small lots or individual pieces while the market for cut sapphire is still generally slow.
We have good inventory of cut sapphire and do not need to cut every good piece of rough we find. There is unmet demand in the custom cutter and hobbyist lapidary market for good rough. We keep a portion of our best production for this purpose as it is quite clear that there is little good product around. A simple search for rough sapphire on Ebay will find many very small pieces which are difficult to cut resulting in a tiny gemstone or many large pieces that are quite clearly only cab grade or worse. We find that many of our customers appreciate being able to buy high quality rough close to the source with guaranteed quality and status as it allows them to cut gems of higher value.
Hope this article has been of interest – please feel free to comment on this or any other of the posts here. Thank you to our customers who have supported Aussie Sapphire in 2005, we appreciate it very much and look forward to doing business over the coming year. If you have just discovered us, check out our website and Ebay Store for lots of great bargains.
Cheers from Andrew and Leah at Aussie Sapphire