Another Look at Gemstones, Part 2

This follows on from part 1, and here are the main precious and semiprecious gems I use as treasure.
Here more than fancy and ornamental stones colour is very variable. Diamonds can come in clear white, ice blue, pink or yellow forms. Spinel comes in a range of colours, as does Topaz. Indeed, some of the best known types are actually different colours of other types: Sapphire, Padparadsha and Ruby are all different colours of Corundum. Similarly Amethyst and Citrine are varieties of Quartz (which has other types in the first post), while Aquamarine, Morganite and Emerald are all variants of Beryl. Thus this post inevitably makes simplifications and should not be taken as a serious mineralogical guide, merely ideas for DMs looking to make their treasure hoards a little more interesting. As always, DM discretion about all aspects (especially value) applies. 

Alexandrite 

Colours: Iridescent/multicoloured
Suggested Values:
Small (pea-sized): 2d6 x 20gp
Medium (hazelnut-sized): 1d10 x 100gp
Large (walnut-sized): 1d10 x 200gp
Huge (tangerine-sized): 1d10 x 500gp

Amber 

Colours: Roll 1d10:
1: Pale Yellow, 2-3: Yellow, 4-7: Golden Yellow, 8-9 Orange, 0: Brown
Suggested Values:
Small (pea-sized): 1d10 x 10gp
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Amethyst 

Colours: Purple

Suggested Values:
Small (pea-sized): 1d10 x 10gp
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Aquamarine 

Colours: Pale Blue

Suggested Values:
Small (pea-sized): 1d10 x 10gp
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Beryl 

Colours: Roll 1d10 1: Clear, 2-3 Red, 4-5 Yellow, 6-0 Green

Suggested Values:
Small (pea-sized): 1
Medium (hazelnut-sized):
Large (walnut-sized):
Huge (tangerine-sized):

Black Pearl 

Colours: Black

Suggested Values:
Small (pea-sized): 1d10 x 100gp
Medium (hazelnut-sized): 1d10 x 200gp
Large (walnut-sized): 2d10 x 200gp
Huge (tangerine-sized): 2d10 x 500gp

Citrine 

Colours: Yellow

Suggested Values:
Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Diamond 

Colours: Roll D10: 1: Blue, 2: Yellow, 3: Pink, 4-0 Clear

Suggested Values:
Small (pea-sized): 1d10 x 300gp
Medium (hazelnut-sized): 2d6 x 500gp
Large (walnut-sized): 2d10 x 1000gp
Huge (tangerine-sized): 3d10 x 2000gp

Emerald 

Colours: Green

Suggested Values:
Small (pea-sized): 1d10 x 300gp
Medium (hazelnut-sized): 2d6 x 500gp
Large (walnut-sized): 2d10 x 1000gp
Huge (tangerine-sized): 3d10 x 2000gp

Fire Opal 

Colours: Orange with Iridescent flecks

Suggested Values:
Small (pea-sized): 1d10 x 300gp
Medium (hazelnut-sized): 2d6 x 500gp
Large (walnut-sized): 2d10 x 1000gp
Huge (tangerine-sized): 3d10 x 2000gp

Garnet 

Colours: Red

Suggested Values:

Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Iolite 

Colours: Purple

Suggested Values:
Small (pea-sized): 1d10 x 10gp 
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Jacinth 

Colours: Orange

Suggested Values:
Small (pea-sized): 1d10 x 100gp
Medium (hazelnut-sized): 1d10 x 200gp
Large (walnut-sized): 2d10 x 200gp
Huge (tangerine-sized): 2d10 x 500gp

Jadeite 

Colours: Cloudy Green

Suggested Values:
Small (pea-sized): 1d10 x 10gp 
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Morganite 

Colours: Pink

Suggested Values:
Small (pea-sized): 1d10 x 10gp 
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp

Opal 

Colours: Pale Blue or Cyan with Iridescent flecks

Suggested Values:
Small (pea-sized): 1d10 x 100gp
Medium (hazelnut-sized): 1d10 x 200gp
Large (walnut-sized): 2d10 x 200gp
Huge (tangerine-sized): 2d10 x 500gp

Padparadsha 

Colours: Pink-Orange

Suggested Values:
Small (pea-sized): 1d10 x 300gp
Medium (hazelnut-sized): 2d6 x 500gp
Large (walnut-sized): 2d10 x 1000gp
Huge (tangerine-sized): 3d10 x 2000gp

Pearl 

Colours: White-Pale Gray

Suggested Values:

Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Peridot 

Colours: Lime Green

Suggested Values:
Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Ruby 

Colours: Red

Suggested Values:
Small (pea-sized): 1d10 x 100gp
Medium (hazelnut-sized): 1d10 x 200gp
Large (walnut-sized): 2d10 x 200gp
Huge (tangerine-sized): 2d10 x 500gp

Sapphire 

Colours: Roll 1d10: 1: Pink, 2: Yellow, 3-0: Blue

Suggested Values:
Small (pea-sized): 1d10 x 100gp
Medium (hazelnut-sized): 1d10 x 200gp
Large (walnut-sized): 2d10 x 200gp
Huge (tangerine-sized): 2d10 x 500gp

Scheelite 

Colours: Yellow

Suggested Values:

Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Spinel 

Colours: Roll 1d10: 1-2: Blue, 3-4: Purple, 5-0: Red

Suggested Values:
Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Topaz 

Colours: Roll 1d10: 1-2 Blue, 3-4: Orange, 5-0: Yellow

Suggested Values:

Small (pea-sized): 1d6 x 50gp
Medium (hazelnut-sized): 2d6 x 50gp
Large (walnut-sized): 2d10 x 50gp
Huge (tangerine-sized): 2d10 x 100gp

Zircon 

Colours: Roll 1d10: 1-2 Blue, 3-4 Green, 5-6 Orange, 7-0 Brown

Suggested Values:
Small (pea-sized): 1d10 x 10gp 
Medium (hazelnut-sized): 1d10 x 20gp
Large (walnut-sized): 2d10 x 20gp
Huge (tangerine-sized): 2d10 x 50gp