If we will look at Dynavector catalog of cartridges we will not find anything with Ruby cantilever anymore. But the Diamond cantilever is still there on 17D3.
"Its very short (1.7mm) solid diamond cantilever give a huge reduction in 'frequency dispersion', unmatched dynamics and a high frequency extension all the way up to 100kHz. The latest patented magnet circuit design increases the output to 0.3mV with crystal clear mid-range and treble even during the largest symphonic crescendos. The main change to the new Dynavector 17D3 is an improvement in the design of the front yoke. This appears, on the surface, to be a small difference yet contributes to a greatly improved overall performance justifying a model number change. The Dynavector Karat is notable for its gemstone cantilever. This 1.7mm long by 0.25mm diameter solid diamond cantilever has its 0.07 square mm stylus mounting hole precision cut by laser. The Micro Ridge Stylus of 0.07 square mm nude diamond is securely and accurately bonded to the cantilever. The armature of 0.9mm square and 0.4mm thick is much smaller than normal, upon which are wound 60 turns per channel of 12 micron fine wire."
Specs for 17D3 in comparison of the specs for 17DS:
Output Voltage: 0.3 mV /////// 0.2 mV (5 cm / sec 1 kHz)
Channel Separation: 25 dB /////// 20 dB (1 kHz)
Frequency response: 20 - 100,000Hz /////// 20 - 90,000Hz
Compliance: 15 x 10-6 /////// 15 x 10-6 cm/dyn
Tracking force: 1.8 - 2.2 grams /////// 1.7 - 2.0 grams
DC resistance: 32Ω /////// 32Ω
Cantilever: 1.7mm length, 0.25dia solid diamond //// .... ???
Stylus: Micro-Ridge .... /////// 0.08 × 3 mil Micro-Ridge
Weight 5.8 g /////// 5.3 g
"Its very short (1.7mm) solid diamond cantilever give a huge reduction in 'frequency dispersion', unmatched dynamics and a high frequency extension all the way up to 100kHz. The latest patented magnet circuit design increases the output to 0.3mV with crystal clear mid-range and treble even during the largest symphonic crescendos. The main change to the new Dynavector 17D3 is an improvement in the design of the front yoke. This appears, on the surface, to be a small difference yet contributes to a greatly improved overall performance justifying a model number change. The Dynavector Karat is notable for its gemstone cantilever. This 1.7mm long by 0.25mm diameter solid diamond cantilever has its 0.07 square mm stylus mounting hole precision cut by laser. The Micro Ridge Stylus of 0.07 square mm nude diamond is securely and accurately bonded to the cantilever. The armature of 0.9mm square and 0.4mm thick is much smaller than normal, upon which are wound 60 turns per channel of 12 micron fine wire."
Specs for 17D3 in comparison of the specs for 17DS:
Output Voltage: 0.3 mV /////// 0.2 mV (5 cm / sec 1 kHz)
Channel Separation: 25 dB /////// 20 dB (1 kHz)
Frequency response: 20 - 100,000Hz /////// 20 - 90,000Hz
Compliance: 15 x 10-6 /////// 15 x 10-6 cm/dyn
Tracking force: 1.8 - 2.2 grams /////// 1.7 - 2.0 grams
DC resistance: 32Ω /////// 32Ω
Cantilever: 1.7mm length, 0.25dia solid diamond //// .... ???
Stylus: Micro-Ridge .... /////// 0.08 × 3 mil Micro-Ridge
Weight 5.8 g /////// 5.3 g