Jewelry, Gems, & Minerals/Cubic Zirconia Setting
I am having a ring made. It is a replica of a costume ring that is of high sentimental value. I want the stone set with glue. A yellow Cubic Zirconia. Can you advise me if I need to ask the maker to make the holder of the stone any special shape (I read your advice re no glue at the back just around edge). I might just be in time to ask for an alteration is you advise that. Kind regards Martina.
Thank you very much for including the illustrated rendering of the ring. This is apparently a software enabled rendering and often the program includes instructions for a milling or wax printing machine. Thius process is a good one and results are generally quite close to the design approved by the customer.
I recommended a bezel type setting for the gemstone and your sketch shows just such a setting. Another example is shown at this link: http://www.since1910.com/ur8958-solitaire-bezel-set-diamond-engagement-ring?gcli
There are two factors needed to make the glue method as secure as possible and also to allow for cleaning the gem and keeping cement off the pavilion (bottom side) of the CZ. First of all, the open hole below the gem should be as large as possible within reason to maintain a strong ring. The large hole helps expose the bottom of the gem, avoiding a pulling of cement along the sides from metal touching the stone below the girdle( waist) of the gem. Also, this allows liquid cleaning solutions to go behind the stone to clean it as needed. The seat for the gem is a groove-like ledge cut into the top of the bezel inside, just large enough for the stone to fit on the ledge neatly, fairly snugly and level with the ring. That little ledge is the only place the cement needs to be applied and sparingly at that, just enough to maintain contact with the gem all around the bezel. The gems must be wiped clean with alcohol or suitable solvent to any trace of finger prints, oils, etc., are removed. This cleaning allows the strongest cement joint with the stone.
I recommend two type of suitable cement: Ultraviolet curing glass cement or a water clear two part epoxy cement such as Hughes 330. Both may be found on the net for purchase by the jeweler simply to see the sort of cement to which I refer. Recommended as the first choice is the ultraviolet light curing cement. The sort used by watch repairmen and watch service businesses to secure glass crystals to watch cases is ideal. This cement forms a quite strong joining and is hardened (cured) by exposure to a uv lamp or bright sunlight. A sample drop is placed on a surface beside the ring while curing. When the drop is cured, so is the cement holding the gemstone. The water clear and colorless version of the cement will not show and does not tend to run as the epoxy might.
Example of cement source: https://www.cousinsuk.com/catalog/consumables/watch-glass-adhesive
Martina, keep these factors in mind and your yellow gem should stay secure for a long time and be fairly easily cleaned. NO solvents should be used for cleaning which might loosen the cement! A water based detergent will do will overall.
There you are! The answer is complete. Should you need further information or have another question concerning this subject, do not hesitate to us a follow-up to contact me.
God Bless and Peace. Thomas.