Aquafilter - for differentiating blue gemstones, separating Aquamarine from Topaz and other blue gems.  Using the Aquafilter, here is the appearance of pale blue gemstones:

 

Ruby Filter - A green filter for discriminating among red stones such as Ruby, Spinel, Tourmaline, and Garnets.  Using the Ruby Filter, here is the appearance of various red and pink gemstones:

Gemstone	Apparent Color
Ruby	Bright Blue
Red Glass	Dark Purple
Spinel	Gray/Blue
Pink Spinel	Light Blue
Pink Sapphire	Light Blue
Tourmaline	Gray/Purple
Almandine Garnet	Gray
Rhodolite Garnet	Gray
Pyrope Garnet	Brownish
Red Beryl	Gray

 

Synthetic Emerald Characterization Set - a 2 filter set which allows one to quickly separate synthetic Emeralds (flux or hydrothermal) from natural Emeralds.  Used in conjunction with the Chelsea Colour Filter, this filter set greatly simplifies the recognition of synthetic emeralds.  Just remember, "Red, Red, Drop Dead!".  Select this link for more details on the Synthetic Emerald set.

Bead Buyer's and Parcel Picker's Filter Set - a 4 filter set designed for the simultaneous examination of a number of gemstones, either as a string of beads or a parcel of loose stones.  The idea is that if all the beads or stones in a set are of identical material, they will appear the same when viewed through any filter in this set.

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