What colors?  

all of them, I'm not a big fan of pink or yellow, but others like them, so make all of them.

I am also into fashion accessory designing. Earth tone is just perfect for an accessory but I agree that not everybody loves it. People usually use accessories which go well with their clothes. Since it is summer you can make some bright colored items which comes in different colors. Just make sure the colors fit each other. Regarding the trend, in my country the color trend is a shade of purple and pink. People from different age brackets wear this color everywhere. Buyers would love to look and choose from different items/colors so it is also better to not concentrate on one color only.

Make a section of your website where you can interact with your potential customers. Here they might give you 'commissions' for whatever colours they prefer. Earth colours are really a mixture of pure colours. A tiny crystal or a dew-drop amongst earth or moss might unexpectedly sparkle with pure and bright rainbow colours.

Just wanted to let you know that I went to your profile and I had to copy and paste the link to your site in a new tab. You should really make it a html link so that people can just click on it and it takes them to your site.

I like browns. I'm thinking of jewelry I own, or have owned, and I've worn blue, and one of my favorite necklaces that eventually broke, was red. It was like red crystals (not real ones of course) bunched together in a unique shape. It was cheap, but it didn't look it. I'm sure you have really great taste, and whatever you do make is bound to be really good.

Right now, spring/summer colors are popular. I sell a lot of light blues, aquas, light greens and teals right now. I try to keep many colors available in my shop though...you never know what a potential customer is looking for.
But right now, I concentrate on the colors that sell best for me in the warm weather.

I go for burgundy jewels and pink. It does depend on what I am going to wear and so forth. I don't care for clashing stuff or too loud. Anklet sound interesting. I used to wear them when I was younger but my ankles are too wide for them now days. I like earth tones too but it really deprends and since I wear alot of pink and burgundy I like browns and greys to wear with them or the same color. I love grey too because it tends to go with just about anything and look nice.

Reds lots of reds and cobalt blues, Jade and Emerald Greens, Black like Apache Tears or Obsidian, I love colors. Vibrant colors, Purples too.

I like pink and blue.

I generally purchase jewellery that suit with colours combination with my dresses,
Jewellery that are combination of various colours, muticolours are very useful that suit most of my dress.I like colours like blue yellow sapphire, pink.